| RFC 9620 | Guidelines for HRPC | September 2024 |
| Grover & ten Oever | Informational | [Page] |
This document sets guidelines for human rights considerations for developers working on network protocols and architectures, similar to the work done on the guidelines for privacy considerations (RFC 6973). This is an updated version of the guidelines for human rights considerations in RFC 8280.¶
This document is a product of the Human Right Protocol Considerations (HRPC) Research Group in the IRTF.¶
This document is not an Internet Standards Track specification; it is published for informational purposes.¶
This document is a product of the Internet Research Task Force (IRTF). The IRTF publishes the results of Internet-related research and development activities. These results might not be suitable for deployment. This RFC represents the consensus of the Human Rights Protocol Considerations Research Group of the Internet Research Task Force (IRTF). Documents approved for publication by the IRSG are not candidates for any level of Internet Standard; see Section 2 of RFC 7841.¶
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9620.¶
Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved.¶
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document.¶
This document outlines a set of human rights protocol considerations for protocol developers. It provides questions that engineers should ask themselves when developing or improving protocols if they want to understand how their decisions can potentially influence the exercise of human rights on the Internet. It should be noted that the impact of a protocol cannot solely be deduced from its design, but its usage and implementation should also be studied to form a full human rights impact assessment.¶
The questions are based on the research performed by the Human Rights Protocol Considerations (HRPC) Research Group, which has been documented before these considerations. The research establishes that human rights relate to standards and protocols and offers a common vocabulary of technical concepts that influence human rights and how these technical concepts can be combined to ensure that the Internet remains an enabling environment for human rights. With this, the contours of a model for developing human rights protocol considerations has taken shape.¶
This document is an iteration of the guidelines that can be found in [RFC8280]. The methods for conducting human rights reviews (Section 3.2) and the guidelines for human rights considerations (Section 3.3) in this document are being tested for relevance, accuracy, and validity [HR-RT]. The understanding of what human rights are is based on the "Universal Declaration of Human Rights" [UDHR] and subsequent treaties that jointly form the body of international human rights law [UNHR].¶
This document does not provide a detailed taxonomy of the nature of (potential) human rights violations, whether direct or indirect / long-term or short-term, that certain protocol choices might present. In part, it is because this is highly context-dependent and also because this document aims to provide a practical set of guidelines. However, further research in this field would definitely benefit developers and implementers.¶
This informational document has consensus for publication from the Internet Research Task Force (IRTF) Human Right Protocol Considerations (HRPC) Research Group. It has been reviewed, tried, and tested by both the research group as well as researchers and practitioners from outside the research group. The research group acknowledges that the understanding of the impact of Internet protocols and architecture on society is a developing practice and is a body of research that is still ongoing. This document is not an IETF product and is not a standard.¶
Threats to the exercise of human rights on the Internet come in many forms. Protocols and standards may harm or enable the right to freedom of expression; right to freedom of information; right to non-discrimination; right to equal protection; right to participate in cultural life, arts, and science; right to freedom of assembly and association; right to privacy; and right to security. An end user who is denied access to certain services or content may be unable to disclose vital information about the malpractices of a government or other authority. A person whose communications are monitored may be prevented or dissuaded from exercising their right to freedom of association or participate in political processes [Penney]. In a worst-case scenario, protocols that leak information can lead to physical danger. A realistic example to consider is when individuals perceived as threats to the state are subjected to torture, extra-judicial killing, or detention on the basis of information gathered by state agencies through the monitoring of network traffic.¶
This document presents several examples of how threats to human rights materialize on the Internet. This threat modeling is inspired by "Privacy Considerations for Internet Protocols" [RFC6973], which is based on security threat analysis. This method is a work in progress and by no means a perfect solution for assessing human rights risks in Internet protocols and systems. Certain specific human rights threats are indirectly considered in Internet protocols as part of the security considerations [RFC3552]; however, privacy considerations [RFC6973] or reviews, let alone human rights impact assessments of protocols, are neither standardized nor implemented.¶
Many threats, enablers, and risks are linked to different rights. This is not surprising if one takes into account that human rights are interrelated, interdependent, and indivisible. However, here we're not discussing all human rights because not all human rights are relevant to Information and Communication Technologies (ICTs) in general and to protocols and standards in particular [Orwat]:¶
The main source of the values of human rights is the International Bill of Human Rights that is composed of the Universal Declaration of Human Rights (UDHR) [UDHR] along with the International Covenant on Civil and Political Rights (ICCPR) [ICCPR] and the International Covenant on Economic, Social and Cultural Rights (ICESCR) [ICESCR]. In the light of several cases of Internet censorship, the UN Human Rights Council Resolution 20/8 was adopted in 2012, affirming that "...the same rights that people have offline must also be protected online..." [UNHRC2016]. In 2015, the Charter of Human Rights and Principles for the Internet [IRP] was developed and released [Jorgensen]. According to these documents, some examples of human rights relevant for ICT systems are human dignity (Art. 1 UDHR), non-discrimination (Art. 2), rights to life, liberty and security (Art. 3), freedom of opinion and expression (Art. 19), freedom of assembly and association (Art. 20), rights to equal protection, legal remedy, fair trial, due process, presumed innocent (Art. 7-11), appropriate social and international order (Art. 28), participation in public affairs (Art. 21), participation in cultural life, protection of intellectual property (Art. 27), and privacy (Art. 12).¶
A partial catalog of human rights related to ICTs, including economic rights, can be found in [Hill].¶
This is by no means an attempt to exclude specific rights or prioritize some rights over others.¶
Ideally, protocol developers and collaborators should incorporate human rights considerations into the design process itself (see Section 3.1 ("Analyzing Internet-Drafts Based on Guidelines for Human Rights Considerations Model")). This section provides guidance on how to conduct a human rights review, i.e., gauge the impact or potential impact of a protocol or standard on human rights.¶
Human rights reviews can be done by any participant and can take place at different stages of the development process of an Internet-Draft. Generally speaking, it is easier to influence the development of a technology at earlier stages than at later stages. This does not mean that reviews at Last Call are not relevant, but they are less likely to result in significant changes in the reviewed document.¶
Human rights reviews can be done by document authors, document shepherds, members of review teams, advocates, or impacted communities to influence the standards development process. IETF documents can benefit from people with different knowledge, perspectives, and backgrounds, especially since their implementations can impact many different communities as well.¶
Methods for analyzing technology for specific human rights impacts are still quite nascent. Currently, five methods have been explored by the human rights review team, often in conjunction with each other.¶
This analysis of Internet-Drafts uses the model as described in Section 4. The outlined categories and questions can be used to review an Internet-Draft. The advantage of this is that it provides a known overview, and document authors can go back to this document as well as [RFC8280] to understand the background and the context.¶
When reviewing an Internet-Draft, specific human rights impacts can become apparent by doing a close reading of the draft and seeking to understand how it might affect networks or society. While less structured than the straight use of the human rights considerations model, this analysis may lead to new speculative understandings of links between human rights and protocols.¶
Interviews with document authors, active members of the working group, or experts in the field can help explore the characteristics of the protocol and its effects. There are two main advantages to this approach:¶
Protocols impact users of the Internet. Interviews can help the reviewer understand how protocols affect the people that use the protocols. Since human rights are best understood from the perspective of the rights-holder, this approach will improve the understanding of the real-world effects of the technology. At the same time, it can be hard to attribute specific changes to a particular protocol; this is of course even harder when a protocol has not been widely deployed.¶
The reality of deployed protocols can be at odds with the expectations during the protocol design and development phase [RFC8980]. When a specification already has associated running code, the code can be analyzed either in an experimental setting or on the Internet where its impact can be observed. In contrast to reviewing the draft text, this approach can allow the reviewer to understand how the specifications work in practice and potentially what unknown or unexpected effects the technology has.¶
This section provides guidance for document authors in the form of a questionnaire about protocols and how technical decisions can shape the exercise of human rights. The questionnaire may be useful at any point in the design process, particularly after the document authors have developed a high-level protocol model as described in [RFC4101]. These guidelines do not seek to replace any existing referenced specifications but, rather, contribute to them and look at the design process from a human rights perspective.¶
Protocols and Internet Standards might benefit from a documented discussion of potential human rights risks arising from potential misapplications of the protocol or technology described in the Request for Comments (RFC). This might be coupled with an Applicability Statement for that RFC.¶
Note that the guidance provided in this section does not recommend specific practices. The range of protocols developed in the IETF is too broad to make recommendations about particular uses of data or how human rights might be balanced against other design goals. However, by carefully considering the answers to the following questions, document authors should be able to produce a comprehensive analysis that can serve as the basis for discussion on whether the protocol adequately takes specific human rights threats into account. This guidance is meant to help the thought process of a human rights analysis; it does not provide specific directions for how to write a human rights considerations section (following the example set in [RFC6973]).¶
In considering these questions, authors will need to be aware of the potential of technical advances or the passage of time to undermine protections. In general, considerations of rights are likely to be more effective if they have a purpose and specific use cases rather than abstract, absolute goals.¶
Also note that while the section uses the word "protocol", the principles identified in these questions may be applicable to other types of solutions (extensions to existing protocols, architecture for solutions to specific problems, etc.).¶
Question(s): Does your protocol depend on or allow for protocol-specific functions at intermediary nodes?¶
Explanation: The end-to-end principle [Saltzer] holds that certain functions can and should be performed at "ends" of the network. [RFC1958] states that "in very general terms, the community believes that the goal is connectivity ... and the intelligence is end to end rather than hidden in the network". There are new opportunities for failure when a protocol exchange includes both endpoints and an intermediary, especially when the intermediary is not under control of either endpoint, or is even largely invisible to it, for instance, as with intercepting HTTPS proxies [HTTPS-interception]. This pattern also contributes to ossification because the intermediaries may impose protocol restrictions -- sometimes in violation of the specification -- that prevent the endpoints from using more modern protocols, as described in Section 9.3 of [RFC8446].¶
Note that intermediaries are distinct from services. In the former case, the third-party element is part of the protocol exchange; whereas in the latter, the endpoints communicate explicitly with the service. The client/server pattern provides clearer separation of responsibilities between elements than having an intermediary. However, even in client/server systems, it is often good practice to provide for end-to-end encryption between endpoints for protocol elements that are outside of the scope of the service, as in the design of Messaging Layer Security (MLS) [RFC9420].¶
Example: Encryption between the endpoints can be used to protect the protocol from interference by intermediaries. The encryption of transport layer information in QUIC [RFC9000] and of the TLS Server Name Indication (SNI) field [TLS-ESNI] are examples of this practice. One consequence of this is to limit the extent to which network operators can inspect traffic, requiring them to have control of the endpoints in order to monitor their behavior.¶
Impacts:¶
Questions(s): Is your protocol optimized for low-bandwidth and high-latency connections? Could your protocol also be developed in a stateless manner?¶
Considering the fact that network quality and conditions vary across geography and time, it is also important to design protocols such that they are reliable even on low-bandwidth and high-latency connections.¶
Impacts:¶
Question(s): Is your protocol fault tolerant? Does it downgrade gracefully, i.e., with mechanisms for fallback and/or notice? Can your protocol resist malicious degradation attempts? Do you have a documented way to announce degradation? Do you have measures in place for recovery or partial healing from failure? Can your protocol maintain dependability and performance in the face of unanticipated changes or circumstances?¶
Explanation: Reliability and resiliency ensures that a protocol will execute its function consistently and resistant to error, as described, and will function without unexpected results. Measures for reliability in protocols assure users that their intended communication was successfully executed.¶
A system that is reliable degrades gracefully and will have a documented way to announce degradation. It will also have mechanisms to recover from failure gracefully and, if applicable, will allow for partial healing.¶
It is important here to draw a distinction between random degradation and malicious degradation. Some attacks against previous versions of TLS, for example, exploited TLS' ability to gracefully downgrade to non-secure cipher suites [FREAK] [Logjam]; from a functional perspective, this is useful, but from a security perspective, this can be disastrous.¶
For reliability, it is necessary that services notify the users if a delivery fails. In the case of real-time systems, in addition to the reliable delivery, the protocol needs to safeguard timeliness.¶
Example: In the modern IP stack structure, a reliable transport layer requires an indication that transport processing has successfully completed, such as given by TCP's ACK message [RFC9293]. Similarly, an application-layer protocol may require an application-specific acknowledgement that contains, among other things, a status code indicating the disposition of the request (see [RFC3724]).¶
Impacts:¶
Question(s): Does your protocol include explicit or implicit plaintext elements, in either the payload or the headers, that can be used for differential treatment? Is there a way to minimize leaking such data to network intermediaries? If not, is there a way for deployments of the protocol to make the differential treatment (including prioritization of certain traffic), if any, auditable for negative impacts on net neutrality?¶
Example: When network intermediaries are able to determine the type of content that a packet is carrying, then they can use that information to discriminate in favor of one type of content and against another. This impacts users' ability to send and receive the content of their choice.¶
As recommended in [RFC8558], protocol designers should avoid the construction of implicit signals of their content. In general, protocol designers should avoid adding explicit signals for intermediaries. In certain cases, it may be necessary to add such explicit signals, but designers should only do so when they provide clear benefit to end users (see [RFC8890] for more on the priority of constituencies). In these cases, the implications of those signals for human rights should be documented.¶
Note that many protocols provide signals that are intended for endpoints that can be used as implicit signals by intermediaries for traffic discrimination, based on either the content (e.g., TCP port numbers) or the sender/receiver (IP addresses). Where possible, these should be protected from intermediaries by encryption. In many cases (e.g., IP addresses), these signals are difficult to remove; but in other cases, such as TLS Application Layer Protocol Negotiation [RFC7301], there are active efforts to protect this data [TLS-ESNI].¶
Impacts:¶
Question(s): Does your protocol or specification define text string elements, in the payload or headers, that have to be understood or entered by humans? Does your specification allow Unicode? If so, do you accept texts in one character set (which must be UTF-8) or several (which is dangerous for interoperability)? If charsets or encodings other than UTF-8 are allowed, does your specification mandate a proper tagging of the charset? Did you have a look at [RFC6365]?¶
Explanation: Internationalization refers to the practice of making protocols, standards, and implementations usable in different languages and scripts (see Section 4.6 ("Localization")). In the IETF, internationalization means to add or improve the handling of non-ASCII text in a protocol [RFC6365]. A different perspective, more appropriate to protocols that are designed for global use from the beginning, is the definition used by the World Wide Web Consortium (W3C) [W3Ci18nDef]:¶
Internationalization is the design and development of a product, application or document content that enables easy localization for target audiences that vary in culture, region, or language.¶
Many protocols that handle text only handle one charset (US-ASCII) or leave the question of what coded charset and encoding are used up to local guesswork (which leads, of course, to interoperability problems). If multiple charsets are permitted, they must be explicitly identified [RFC2277]. Adding non-ASCII text to a protocol allows the protocol to handle more scripts, hopefully representing users across the world. In today's world, that is normally best accomplished by allowing only Unicode encoded in UTF-8.¶
In current IETF practice [RFC2277], internationalization is aimed at user-facing strings, not protocol elements, such as the verbs used by some text-based protocols. (Do note that some strings are both content and protocol elements, such as identifiers.) Although this is reasonable practice for non-user visible elements, developers should provide full and equal support for all scripts and charsets in the user-facing features of protocols and for any content they carry.¶
Example: See Section 4.6 ("Localization").¶
Impacts:¶
Question(s): Does your protocol uphold the standards of internationalization? Have you made any concrete steps towards localizing your protocol for relevant audiences?¶
Explanation: "Localization refers to the adaptation of a product, application or document content to meet the language, cultural and other requirements of a specific target market (a 'locale')" [W3Ci18nDef]. For our purposes, it can be described as the practice of translating an implementation to make it functional in a specific language or for users in a specific locale (see Section 4.5 ("Internationalization")). Internationalization is related to localization, but they are not the same. Internationalization is a necessary precondition for localization.¶
Example: The Internet is a global medium, but many of its protocols and products are developed with certain audiences in mind that often share particular characteristics like knowing how to read and write in American Standard Code for Information Interchange (ASCII) and knowing English. This limits the ability of a large part of the world's online population from using the Internet in a way that is culturally and linguistically accessible. An example of a standard that has taken into account the view that individuals like to have access to data in their preferred language can be found in [RFC5646]. The document describes a way to label information with an identifier for the language in which it is written. And this allows information to be presented and accessed in more than one language.¶
Impacts:¶
Question(s): Is your protocol fully documented in a way that it could be easily implemented, improved, built upon, and/or further developed? Do you depend on proprietary code for the implementation, running, or further development of your protocol? Does your protocol favor a particular proprietary specification over technically equivalent competing specification(s), for instance, by making any incorporated vendor specification "required" or "recommended" [RFC2026]? Do you normatively reference another standard that is behind a paywall (and could you do without it)? Are you aware of any patents that would prevent your standard from being fully implemented [RFC8179] [RFC6701]?¶
Explanation: The Internet was able to be developed into the global network of networks because of the existence of open, non-proprietary standards [Zittrain]. They are crucial for enabling interoperability. Yet, open standards are not explicitly defined within the IETF. On the subject, [RFC2026] states:¶
Various national and international standards bodies, such as ANSI, ISO, IEEE, and ITU-T, develop a variety of protocol and service specifications that are similar to Technical Specifications defined here [at the IETF]. National and international groups also publish "implementors' agreements" that are analogous to Applicability Statements, capturing a body of implementation-specific detail concerned with the practical application of their standards. All of these are considered to be "open external standards" for the purposes of the Internet Standards Process.¶
Similarly, [RFC3935] does not define open standards but does emphasize the importance of an "open process", i.e.:¶
... any interested person can participate in the work, know what is being decided, and make [their] voice heard on the issue.¶
Open standards (and open source software) allow users to glean information about how the tools they are using work, including the tools' security and privacy properties. They additionally allow for permissionless innovation, which is important to maintain the freedom and ability to freely create and deploy new protocols on top of the communications constructs that currently exist. It is at the heart of the Internet as we know it, and to maintain its fundamentally open nature, we need to be mindful of the need for developing open standards.¶
All standards that need to be normatively implemented should be freely available and with reasonable protection for patent infringement claims so that they can also be implemented in open source or free software. Patents have often held back open standardization or been used against those deploying open standards, particularly in the domain of cryptography [Newegg]. An exemption of this is sometimes made when a standardized protocol normatively relies on specifications produced by others Standards Development Organizations (SDOs) that are not freely available. Patents in open standards or in normative references to other standards should have a patent disclosure [Note-well], royalty-free licensing [Patent-policy], or some other form of fair, reasonable, and non-discriminatory terms.¶
Example: [RFC6108] describes a system for providing critical end-user notifications to web browsers, which has been deployed by Comcast, an Internet Service Provider (ISP). Such a notification system is being used to provide near-immediate notifications to customers, such as to warn them that their traffic exhibits patterns that are indicative of malware or virus infection. There are other proprietary systems that can perform such notifications, but those systems utilize Deep Packet Inspection (DPI) technology. In contrast, that document describes a system that does not rely upon DPI and is instead based on open IETF standards and open source applications.¶
Impacts:¶
Question(s): Does your protocol support heterogeneity by design? Does your protocol allow for multiple types of hardware? Does your protocol allow for multiple types of application protocols? Is your protocol liberal in what it receives and handles? Will it remain usable and open if the context changes?¶
Explanation: The Internet is characterized by heterogeneity on many levels: devices, nodes, router scheduling algorithms, queue management mechanisms, routing protocols, levels of multiplexing, protocol versions and implementations, and underlying link layers (e.g., point-to-point, multi-access links, wireless, Fiber Distributed Data Interface (FDDI), etc.) in the traffic mix and in the levels of congestion at different times and places. Moreover, as the Internet is composed of autonomous organizations and ISPs, each with their own separate policy concerns, there is a large heterogeneity of administrative domains and pricing structures. As a result, the heterogeneity principle proposed in [RFC1958] needs to be supported by design [FIArch].¶
Heterogeneity support in protocols can, thus, enable a wide range of devices and (by extension) users to participate on the network.¶
Example: Heterogeneity significantly contributed to the success of the Internet architecture [Zittrain]. There is a famous quote often attributed to Niels Bohr: "Prediction is very difficult, especially if it's about the future." This also holds true for future uses of the Internet architecture and infrastructure. Therefore, as a rule of thumb, it is important to -- as far as possible -- design your protocol for different devices and uses, especially at lower layers of the stack. However, if you choose not to do this, it could be relevant to document the reasoning for that.¶
Impacts:¶
Question(s): Is your protocol written in a modular fashion, and does it facilitate or hamper extensibility? In this sense, does your protocol impact permissionless innovation? (See Section 4.7 ("Open Standards").)¶
Explanation: Adaptability is closely interrelated with permissionless innovation: both maintain the freedom and ability to create and deploy new protocols on top of the communications constructs that currently exist. It is at the heart of the Internet as we know it, and to maintain its fundamentally open nature, we need to be mindful of the impact of protocols on maintaining or reducing permissionless innovation to ensure that the Internet can continue to develop.¶
Adaptability and permissionless innovation can be used to shape information networks as groups of users prefer. Furthermore, a precondition of adaptability is the ability of the people who can adapt the network to be able to know and understand the network. This is why adaptability and permissionless innovation are inherently connected to the right to education and the right to science as well as the right to freedom of assembly and association and the right to freedom of expression, since it allows the users of the network to determine how to assemble, collaborate, and express themselves.¶
Example: WebRTC generates audio and/or video data. WebRTC can be used in different locations by different parties; WebRTC's standard Application Programming Interfaces (APIs) are developed to support applications from different voice service providers. Multiple parties will have similar capabilities. In order to ensure that all parties can build upon existing standards, these need to be adaptable and allow for permissionless innovation.¶
Impacts:¶
Question(s): Does your protocol maintain, assure, and/or verify the accuracy of payload data? Does your protocol maintain and assure the consistency of data? Does your protocol in any way allow for the data to be (intentionally or unintentionally) altered?¶
Explanation: Integrity refers to the maintenance and assurance of the accuracy and consistency of data to ensure it has not been (intentionally or unintentionally) altered.¶
Example: Integrity verification of data is important to prevent vulnerabilities and attacks from on-path attackers. These attacks happen when a third party (often for malicious reasons) intercepts a communication between two parties, inserting themselves in the middle and changing the content of the data. In practice, this looks as follows:¶
Alice wants to communicate with Bob. Alice sends a message to Bob, which Corinne intercepts and modifies. Bob cannot see that the data from Alice was altered by Corinne. Corinne intercepts and alters the communication as it is sent between Alice and Bob. Corinne is able to control the communication content.¶
Impacts:¶
Question(s): Do you have sufficient measures to confirm the truth of an attribute of a single piece of data or entity? Can the attributes get garbled along the way (see Section 4.13 ("Security"))? If relevant, have you implemented IPsec, DNS Security (DNSSEC), HTTPS, and other standard security best practices?¶
Explanation: Authenticity ensures that data does indeed come from the source it claims to come from. This is important to prevent certain attacks or unauthorized access and use of data.¶
At the same time, authentication should not be used as a way to prevent heterogeneity support, as is often done for vendor lock-in or digital rights management.¶
Example: Authentication of data is important to prevent vulnerabilities and attacks from on-path attackers. These attacks happen when a third party (often for malicious reasons) intercepts a communication between two parties, inserting themselves in the middle and posing as both parties. In practice, this looks as follows:¶
Alice wants to communicate with Bob. Alice sends data to Bob. Corinne intercepts the data sent to Bob. Corinne reads (and potentially alters) the message to Bob. Bob cannot see that the data did not come from Alice but from Corinne.¶
With proper authentication, the scenario would be as follows:¶
Alice wants to communicate with Bob. Alice sends data to Bob. Corinne intercepts the data sent to Bob. Corinne reads and alters the message to Bob. Bob is unable to verify whether that the data came from Alice.¶
Impacts:¶
Question(s): Does the protocol expose the transmitted data over the wire? Does the protocol expose information related to identifiers or data? If so, what does it reveal to each protocol entity (i.e., recipients, intermediaries, and enablers) [RFC6973]? What options exist for protocol implementers to choose to limit the information shared with each entity? What operational controls are available to limit the information shared with each entity?¶
What controls or consent mechanisms does the protocol define or require before personal data or identifiers are shared or exposed via the protocol? If no such mechanisms or controls are specified, is it expected that control and consent will be handled outside of the protocol?¶
Does the protocol provide ways for initiators to share different pieces of information with different recipients? If not, are there mechanisms that exist outside of the protocol to provide initiators with such control?¶
Does the protocol provide ways for initiators to limit the sharing or expressing of individuals' preferences to recipients or intermediaries with regard to the collection, use, or disclosure of their personal data? If not, are there mechanisms that exist outside of the protocol to provide users with such control? Is it expected that users will have relationships that govern the use of the information (contractual or otherwise) with those who operate these intermediaries? Does the protocol prefer encryption over cleartext operation?¶
Explanation: Confidentiality refers to keeping your data secret from unintended listeners [RFC3552]. The growth of the Internet depends on users having confidence that the network protects their personal data [RFC1984]. The possibility of pervasive monitoring and surveillance undermines users' trust and can be mitigated by ensuring confidentiality, i.e., passive attackers should gain little or no information from observation or inference of protocol activity [RFC7258] [RFC7624].¶
Example: Protocols that do not encrypt their payload make the entire content of the communication available to the idealized attacker along their path. Following the advice in [RFC3365], most such protocols have a secure variant that encrypts the payload for confidentiality, and these secure variants are seeing ever-wider deployment. A noteworthy exception is DNS [RFC1035], as DNSSEC [RFC4033] does not have confidentiality as a requirement. This implies that, in the absence of the use of more recent standards like DNS over TLS [RFC7858] or DNS over HTTPS [RFC8484], all DNS queries and answers generated by the activities of any protocol are available to the attacker. When store-and-forward protocols are used (e.g., SMTP [RFC5321]), intermediaries leave this data subject to observation by an attacker that has compromised these intermediaries, unless the data is encrypted end-to-end by the application-layer protocol or the implementation uses an encrypted store for this data [RFC7624].¶
Impacts:¶
Question(s): Did you have a look at "Guidelines for Writing RFC Text on Security Considerations" [RFC3552]? Have you found any attacks that are somewhat related to your protocol/specification yet considered out of scope of your document? Would these attacks be pertinent to the human-rights-enabling features of the Internet (as described throughout this document)?¶
Explanation: Security is not a single monolithic property of a protocol or system but rather a series of related yet somewhat independent properties. Not all of these properties are required for every application. Since communications are carried out by systems and access to systems is through communications channels, security goals obviously interlock, but they can also be independently provided [RFC3552].¶
Typically, any protocol operating on the Internet can be the target of passive attacks (when the attacker can access and read packets on the network) and active attacks (when an attacker is capable of writing information to the network packets) [RFC3552].¶
Impacts:¶
Question(s): Did you have a look at the guidelines described in Section 7 of "Privacy Considerations for Internet Protocols" [RFC6973]? Does your protocol maintain the confidentiality of metadata? Could your protocol counter traffic analysis? Does your protocol adhere to data minimization principles? Does your document identify potentially sensitive data logged by your protocol and/or for how long that needs to be retained for technical reasons?¶
Explanation: Privacy refers to the right of an entity (normally a person), acting on its own behalf, to determine the degree to which it will interact with its environment, including the degree to which the entity is willing to share its personal information with others [RFC4949]. If a protocol provides insufficient privacy protection, it may have a negative impact on freedom of expression as users self-censor for fear of surveillance or find that they are unable to express themselves freely.¶
Impacts:¶
Question(s): Does your protocol make use of identifiers? Are these identifiers persistent? Are they used across multiple contexts? Is it possible for the user to reset or rotate them without negatively impacting the operation of the protocol? Are they visible to others besides the protocol endpoints? Are they tied to real-world identities? Have you considered "Privacy Considerations for Internet Protocols" [RFC6973], especially Section 6.1.2?¶
Explanation: Most protocols depend on the use of some kind of identifier in order to correlate activity over time and space. For instance:¶
In general, these identifiers serve a necessary function for protocol operations by allowing them to maintain continuity. However, they can also create privacy risks. There are two major ways in which those risks manifest:¶
Because identifiers are necessary for protocol operation, true anonymity is very difficult to achieve, but there are practices that promote user privacy even when identifiers are used.¶
Impacts:¶
In general, user privacy is better preserved when identifiers are pseudonymous (not tied to a user's real-world identity).¶
Example: In the development of the IPv6 protocol, it was discussed to embed a Media Access Control (MAC) address into unique IP addresses. This would make it possible for eavesdroppers and other information collectors to identify when different addresses used in different transactions actually correspond to the same node. This is why standardization efforts like "Temporary Address Extensions for Stateless Address Autoconfiguration in IPv6" [RFC8981] and MAC address randomization [MAC-ADDRESS-RANDOMIZATION] have been pursued.¶
Note that it is often attractive to try to create a pseudonym from a persistent identifier. This can be very difficult to do correctly in a way that does not allow for recovering the persistent identifiers.¶
Example: A common practice in web tracking is to "encrypt" email addresses by hashing them, thus allegedly making them "non-personally identifying". However, because hash functions are public operations, it is possible to do a dictionary search for candidate email addresses and recover the original address [Email-hashing].¶
Even true pseudonymous identifiers can present a privacy risk if they are used across a wide enough scope. User privacy is better preserved if identifiers have limited scope both in time and space.¶
Example: An example is the Dynamic Host Configuration Protocol (DHCP) where sending a persistent identifier as the client name was not mandatory but, in practice, done by many implementations before DHCP [RFC7844].¶
Example: Third-party cookies in HTTP allow trackers to correlate HTTP traffic across sites. This is the foundation of a whole ecosystem of web tracking. Increasingly, web browsers are restricting the use of third-party cookies in order to protect user privacy.¶
Question(s): Does your protocol architecture facilitate censorship? Does it include "choke points" that are easy to use for censorship? Does it expose identifiers that can be used to selectively block certain kinds of traffic? Could it be designed to be more censorship resistant? Does your protocol make it apparent or transparent when access to a resource is restricted and why it is restricted?¶
Explanation: Governments and service providers block or filter content or traffic, often without the knowledge of end users [RFC7754]. For a survey of censorship techniques employed across the world, see [RFC9505], which lays out protocol properties that have been exploited to censor access to information. Censorship resistance refers to the methods and measures to prevent Internet censorship.¶
Example: The current design of the Web has a number of architectural choke points where it is possible for censors to intervene. These include obtaining the control of the domain name itself, DNS blocking either at the protocol layer or at the resolver, IP address blocking, and blocking at the web server. There has been extensive work on content distribution systems, which are intended to be more censorship resistant; and some, such as BitTorrent, are in wide use. However, these systems may have inferior reliability and performance compared to the Web (e.g., they do not support active content on the server).¶
Example: Identifiers of content exposed within a protocol might be used to facilitate censorship by allowing the censor to determine which traffic to block. DNS queries, the "host" request header in an HTTP request, and the Server Name Indication (SNI) in a Transport Layer Security (TLS) ClientHello are all examples of protocol elements that can travel in plaintext and be used by censors to identify what content a user is trying to access [RFC9505]. Protocol mechanisms such as Encrypted ClientHello [TLS-ESNI] or DNS over HTTPS [RFC8484] that encrypt metadata provide some level of resistance to this type of protocol inspection. Full traffic encryption systems, such as Tor <https://torproject.org>, can also be used by people to access otherwise censored resources.¶
Example: As noted above, one way to censor web traffic is to require the server to block it or require ISPs to block requests to the server. In HTTP, denial or restriction of access can be made apparent by the use of status code 451, which allows server operators and intermediaries to operate with greater transparency in circumstances where issues of law or public policy affect their operation [RFC7725]. If a protocol potentially enables censorship, protocol designers should strive towards creating error codes that capture different scenarios (e.g., blocked due to administrative policy, unavailable because of legal requirements, etc.) to minimize ambiguity for end users.¶
Impacts:¶
Question(s): Are the intended and foreseen effects of your protocol documented and easily comprehensible? Have you described the central use case(s) for your protocol with a clear description of expected behavior and how it may, or may not, impact other protocols, implementations, user expectations, or behavior? Have you reviewed other protocols that solve similar problems, or made use of similar mechanisms, to see if there are lessons that can be learned from their use and misuse?¶
Explanation: Certain technical choices may have unintended consequences.¶
Example: Lack of authenticity may lead to lack of integrity and negative externalities; of which, spam is an example. Lack of data that could be used for billing and accounting can lead to so-called "free" arrangements that obscure the actual costs and distribution of the costs, for example, the barter arrangements that are commonly used for Internet interconnection, and the commercial exploitation of personal data for targeted advertising, which is the most common funding model for the so-called "free" services such as search engines and social networks. Unexpected outcomes might not be technical but rather architectural, social, or economic. Therefore, it is of importance to document the intended outcomes and other possible outcomes that have been considered.¶
Impacts:¶
Question(s): Is your protocol designed to provide an enabling environment for all? Have you looked at the W3C Web Accessibility Initiative for examples and guidance [W3CAccessibility]?¶
Explanation: Sometimes in the design of protocols, websites, web technologies, or web tools, barriers are created that exclude people from using the Web. The Internet should be designed to work for all people, whatever their hardware, software, language, culture, location, or physical or mental ability. When the Internet technologies meet this goal, it will be accessible to people with a diverse range of hearing, movement, sight, and cognitive ability [W3CAccessibility].¶
Example: The HTML protocol as defined in [HTML] specifically requires that every image must have an alt attribute (with a few exceptions) to ensure images are accessible for people who cannot themselves decipher non-text content in web pages.¶
Another example is the work done in the AVT and AVTCORE Working Groups in the IETF that enables text conversation in multimedia, text telephony, wireless multimedia, and video communications for sign language and lipreading (i.e., [RFC9071]).¶
Impacts:¶
Question(s): Can your protocol be implemented without a single point of control? If applicable, can your protocol be deployed in a federated manner? Does your protocol create additional centralized points of control?¶
Explanation: Decentralization is one of the central technical concepts of the architecture of the Internet and is embraced as such by the IETF [RFC3935]. It refers to the absence or minimization of centralized points of control, a feature that is assumed to make it easy for new users to join and new uses to unfold [Ziewitz]. It also reduces issues surrounding single points of failure and distributes the network such that it continues to function even if one or several nodes are disabled. With the commercialization of the Internet in the early 1990s, there has been a slow move away from decentralization, to the detriment of the technical benefits of having a decentralized Internet. For a more detailed discussion of this topic, please see [Arkko].¶
Example: The bits traveling the Internet are increasingly susceptible to monitoring and censorship from both governments and ISPs as well as third (malicious) parties. The ability to monitor and censor is further enabled by the increased centralization of the network that creates central infrastructure points that can be tapped into. The creation of peer-to-peer networks and the development of voice-over-IP protocols using peer-to-peer technology in combination with Distributed Hash Table (DHT) for scalability are examples of how protocols can preserve decentralization [Pouwelse].¶
Impacts:¶
Question(s): Can your protocol facilitate a negatively impacted party's right to remedy without disproportionately impacting other parties' human rights, especially their right to privacy?¶
Explanation: Providing access to remedy by states and corporations is a part of the UN Guiding Principles on Business and Human Rights [UNGP]. Access to remedy may help victims of human rights violations in seeking justice or allow law enforcement agencies to identify a possible violator. However, current mechanisms in protocols that try to enable "attribution" to individuals impede the exercise of the right to privacy. The former UN Special Rapporteur for Freedom of Expression has also argued that anonymity is an inherent part of freedom of expression [Kaye]. Considering the potential adverse impact of attribution on the right to privacy and freedom of expression, enabling attribution on an individual level is most likely not consistent with human rights.¶
Example: Adding personally identifiable information to data streams as a means to enable the human right to remedy might help in identifying a violator of human rights and provide access to remedy, but this would disproportionately affect all users right to privacy, anonymous expression, and association. Furthermore, there are some recent advances in enabling abuse detection in end-to-end encrypted messaging systems, which also carry some risk to users' privacy [Messenger-franking] [Hecate].¶
Impacts:¶
Question(s): Have you considered potential negative consequences (individual or societal) that your protocol or document might have?¶
Explanation: Publication of a particular RFC under a certain status has consequences. Publication as an Internet Standard as part of the Standards Track may signal to implementers that the specification has a certain level of maturity, operational experience, and consensus. Similarly, publication of a specification as an experimental document not part of the Standards Track would signal to the community that the document "may not be intended to be an Internet Standard, or it may be intended for eventual standardization but not yet ready" for wide deployment [RFC2026]. The extent of the deployment, and consequently its overall impact on end users, may depend on the document status presented in the RFC. See [RFC2026] and updates to it for a fuller explanation.¶
This research group document lays out best practices and guidelines for human rights reviews of network protocols, architectures, and other Internet-Drafts and RFCs.¶
Article three of the "Universal Declaration of Human Rights" reads: "Everyone has the right to life, liberty and security of person" [UDHR]. This article underlines the importance of security and its interrelation with human life and liberty; but since human rights are indivisible, interrelated, and interdependent, security is also closely linked to other human rights and freedoms. This document seeks to strengthen human rights, freedoms, and security by relating and translating these concepts to concepts and practices as they are used in Internet protocol and architecture development. The aim of this is to secure human rights and thereby improve the sustainability, usability, and effectiveness of the network. The document seeks to achieve this by providing guidelines as done in Section 3 of this document.¶
This document has no IANA actions.¶
The discussion list for the IRTF Human Rights Protocol Considerations Research Group is located at the e-mail address: <mailto:[email protected]>.¶
Information on the group and information on how to subscribe to the list is at: <https://www.irtf.org/mailman/listinfo/hrpc>.¶
Archives of the list can be found at: <https://mailarchive.ietf.org/arch/browse/hrpc/>.¶
Thanks to:¶
Reese Enghardt, Joe Hall, Avri Doria, Joey Salazar, Corinne Cath-Speth, Farzaneh Badii, Sandra Braman, Colin Perkins, John Curran, Eliot Lear, Mallory Knodel, Brian Trammell, Jane Coffin, Eric Rescorla, Sofía Celi, and the hrpc list for reviews and suggestions.¶
Individuals who conducted human rights reviews for their work and feedback: Amelia Andersdotter, Shane Kerr, Beatrice Martini, Karan Saini, and Shivan Kaul Sahib.¶