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+Network Working Group                                               IAB
+Request for Comments: 2804                                         IESG
+Category: Informational                                        May 2000
+
+
+                       IETF Policy on Wiretapping
+
+Status of this Memo
+
+   This memo provides information for the Internet community.  It does
+   not specify an Internet standard of any kind.  Distribution of this
+   memo is unlimited.
+
+Copyright Notice
+
+   Copyright (C) The Internet Society (2000).  All Rights Reserved.
+
+Abstract
+
+   The Internet Engineering Task Force (IETF) has been asked to take a
+   position on the inclusion into IETF standards-track documents of
+   functionality designed to facilitate wiretapping.
+
+   This memo explains what the IETF thinks the question means, why its
+   answer is "no", and what that answer means.
+
+1. Summary position
+
+   The IETF has decided not to consider requirements for wiretapping as
+   part of the process for creating and maintaining IETF standards.
+
+   It takes this position for the following basic reasons:
+
+   - The IETF, an international standards body, believes itself to be
+     the wrong forum for designing protocol or equipment features that
+     address needs arising from the laws of individual countries,
+     because these laws vary widely across the areas that IETF standards
+     are deployed in.  Bodies whose scope of authority correspond to a
+     single regime of jurisdiction are more appropriate for this task.
+
+   - The IETF sets standards for communications that pass across
+     networks that may be owned, operated and maintained by people from
+     numerous jurisdictions with numerous requirements for privacy.  In
+     light of these potentially divergent requirements, the IETF
+     believes that the operation of the Internet and the needs of its
+     users are best served by making sure the security properties of
+
+
+
+
+
+IAB & IESG                   Informational                      [Page 1]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+     connections across the Internet are as well known as possible.  At
+     the present stage of our ignorance this means making them as free
+     from security loopholes as possible.
+
+   - The IETF believes that in the case of traffic that is today going
+     across the Internet without being protected by the end systems (by
+     encryption or other means), the use of existing network features,
+     if deployed intelligently, provides extensive opportunities for
+     wiretapping, and should be sufficient under presently seen
+     requirements for many cases. The IETF does not see an engineering
+     solution that allows such wiretapping when the end systems take
+     adequate measures to protect their communications.
+
+   - The IETF believes that adding a requirement for wiretapping will
+     make affected protocol designs considerably more complex.
+     Experience has shown that complexity almost inevitably jeopardizes
+     the security of communications even when it is not being tapped by
+     any legal means; there are also obvious risks raised by having to
+     protect the access to the wiretap. This is in conflict with the
+     goal of freedom from security loopholes.
+
+   - The IETF restates its strongly held belief, stated at greater
+     length in [RFC 1984], that both commercial development of the
+     Internet and adequate privacy for its users against illegal
+     intrusion requires the wide availability of strong cryptographic
+     technology.
+
+   - On the other hand, the IETF believes that mechanisms designed to
+     facilitate or enable wiretapping, or methods of using other
+     facilities for such purposes, should be openly described, so as to
+     ensure the maximum review of the mechanisms and ensure that they
+     adhere as closely as possible to their design constraints. The IETF
+     believes that the publication of such mechanisms, and the
+     publication of known weaknesses in such mechanisms, is a Good
+     Thing.
+
+2. The Raven process
+
+   The issue of the IETF doing work on legal intercept technologies came
+   up as a byproduct of the extensive work that the IETF is now doing in
+   the area if IP-based telephony.
+
+   In the telephony world, there has been a tradition of cooperation
+   (often mandated by law) between law enforcement agencies and
+   telephone equipment operators on wiretapping, leading to companies
+   that build telephone equipment adding wiretapping features to their
+   telephony-related equipment, and an emerging consensus in the
+
+
+
+
+IAB & IESG                   Informational                      [Page 2]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+   industry of how to build and manage such features. Some traditional
+   telephony standards organizations have supported this by adding
+   intercept features to their telephony-related standards.
+
+   Since the future of the telephone seems to be intertwined with the
+   Internet it is inevitable that the primary Internet standards
+   organization would be faced with the issue sooner or later.
+
+   In this case, some of the participants of one of the IETF working
+   groups working on a new standard for communication between components
+   of a distributed phone switch brought up the issue. Since adding
+   features of this type would be something the IETF had never done
+   before, the IETF management decided to have a public discussion
+   before deciding if the working group should go ahead. A new mailing
+   list was created (the Raven mailing list, see
+   http://www.ietf.org/mailman/listinfo/raven) for this discussion.
+   Close to 500 people subscribed to the list and about 10% of those
+   sent at least one message to the list. The discussion on this list
+   was a precursor to a discussion held during the IETF plenary in
+   Washington, D.C.
+
+   Twenty-nine people spoke during the plenary session. Opinions ranged
+   from libertarian: 'governments have no right to wiretap' - to
+   pragmatic: 'it will be done somewhere, best have it done where the
+   technology was developed'. At the end of the discussion there was a
+   show of hands to indicate opinions: should the IETF add special
+   features, not do this or abstain. Very few people spoke out strongly
+   in support for adding the intercept features, while many spoke out
+   against it, but a sizable portion of the audience refused to state an
+   opinion (raised their hands when asked for "abstain" in the show of
+   hands).
+
+   This is the background on the basis of which the Internet Engineering
+   Steering Group (IESG) and the Internet Architecture Board (IAB) was
+   asked to formulate a policy.
+
+3. A definition of wiretapping
+
+   The various legal statutes defining wiretapping do not give adequate
+   definitions to distinguish between wiretapping and various other
+   activities at the technical level. For the purposes of this memo, the
+   following definition of wiretapping is used:
+
+   Wiretapping is what occurs when information passed across the
+   Internet from one party to one or more other parties is delivered to
+   a third party:
+
+
+
+
+
+IAB & IESG                   Informational                      [Page 3]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+   1. Without the sending party knowing about the third party
+
+   2. Without any of the recipient parties knowing about the delivery to
+      the third party
+
+   3. When the normal expectation of the sender is that the transmitted
+      information will only be seen by the recipient parties or parties
+      obliged to keep the information in confidence
+
+   4. When the third party acts deliberately to target the transmission
+      of the first party, either because he is of interest, or because
+      the second party's reception is of interest.
+
+   The term "party", as used here, can refer to one person, a group of
+   persons, or equipment acting on behalf of persons; the term "party"
+   is used for brevity.
+
+   Of course, many wiretaps will be bidirectional, monitoring traffic
+   sent by two or more parties to each other.
+
+   Thus, for instance, monitoring public newsgroups is not wiretapping
+   (condition 3 violated), random monitoring of a large population is
+   not wiretapping (condition 4 violated), a recipient passing on
+   private email is not wiretapping (condition 2 violated).
+
+   An Internet equivalent of call tracing by means of accounting logs
+   (sometimes called "pen registers") that is a feature of the telephone
+   network is also wiretapping by this definition, since the normal
+   expectation of the sender is that the company doing the accounting
+   will keep this information in confidence.
+
+   Wiretapping may logically be thought of as 3 distinct steps:
+
+   - Capture - getting information off the wire that contains the
+     information wanted.
+
+   - Filtering - selecting the information wanted from information
+     gathered by accident.
+
+   - Delivery - transmitting the information wanted to the ones who want
+     it.
+
+   The term applies to the whole process; for instance, random
+   monitoring followed by filtering to extract information about a
+   smaller group of parties would be wiretapping by this definition.
+
+   In all these stages, the possibility of using or abusing mechanisms
+   defined for this purpose for other purposes exists.
+
+
+
+IAB & IESG                   Informational                      [Page 4]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+   This definition deliberately does not include considerations of:
+
+   - Whether the wiretap is legal or not, since that is a legal, not a
+     technical matter.
+
+   - Whether the wiretap occurs in real time, or can be performed after
+     the fact by looking at information recorded for other purposes
+     (such as the accounting example given above).
+
+   - What the medium targeted by the wiretap is - whether it is email,
+     IP telephony, Web browsing or EDI transfers.
+
+   These questions are believed to be irrelevant to the policy outlined
+   in this memo.
+
+   Wiretapping is also sometimes called "interception", but that term is
+   also used in a sense that is considerably wider than the monitoring
+   of data crossing networks, and is therefore not used here.
+
+4. Why the IETF does not take a moral position
+
+   Much of the debate about wiretapping has centered around the question
+   of whether wiretapping is morally evil, no matter who does it,
+   necessary in any civilized society, or an effective tool for catching
+   criminals that has been abused in the past and will be abused again.
+
+   The IETF has decided not to take a position in this matter, since:
+
+   - There is no clear consensus around a single position in the IETF.
+
+   - There is no means of detecting the morality of an act "on the
+     wire".  Since the IETF deals with protocol standardization, not
+     protocol deployment, it is not in a position to dictate that its
+     product is only used in moral or legal ways.
+
+   However, a few observations can be made:
+
+   - Experience shows that tools which are effective for a purpose tend
+     to be used for that purpose.
+
+   - Experience shows that tools designed for one purpose that are
+     effective for another tend to be used for that other purpose too,
+     no matter what its designers intended.
+
+   - Experience shows that if a vulnerability exists in a security
+     system, it is likely that someone will take advantage of it sooner
+     or later.
+
+
+
+
+IAB & IESG                   Informational                      [Page 5]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+   - Experience shows that human factors, not technology per se, is the
+     biggest single source of such vulnerabilities.
+
+   What this boils down to is that if effective tools for wiretapping
+   exist, it is likely that they will be used as designed, for purposes
+   legal in their jurisdiction, and also in ways they were not intended
+   for, in ways that are not legal in that jurisdiction. When weighing
+   the development or deployment of such tools, this should be borne in
+   mind.
+
+5. Utility considerations
+
+   When designing any communications function, it is a relevant question
+   to ask if such functions efficiently perform the task they are
+   designed for, or whether the work spent in developing them is not, in
+   fact, worth the benefit gained.
+
+   Given that there are no specific proposals being developed in the
+   IETF, the IETF cannot weigh proposals for wiretapping directly in
+   this manner.
+
+   However, as above, a few general observations can be made:
+
+   - Wiretapping by copying the bytes passed between two users of the
+     Internet with known, static points of attachment is not hard.
+     Standard functions designed for diagnostic purposes can accomplish
+     this.
+
+   - Correlating users' identities with their points of attachment to
+     the Internet can be significantly harder, but not impossible, if
+     the user uses standard means of identification. However, this means
+     linking into multiple Internet subsystems used for address
+     assignment, name resolution and so on; this is not trivial.
+
+   - An adversary has several simple countermeasures available to defeat
+     wiretapping attempts, even without resorting to encryption. This
+     includes Internet cafes and anonymous dialups, anonymous remailers,
+     multi-hop login sessions and use of obscure communications media;
+     these are well known tools in the cracker community.
+
+   - Of course, communications where the content is protected by strong
+     encryption can be easily recorded, but the content is still not
+     available to the wiretapper, defeating all information gathering
+     apart from traffic analysis.  Since Internet data is already in
+     digital form, encrypting it is very simple for the end-user.
+
+
+
+
+
+
+IAB & IESG                   Informational                      [Page 6]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+   These things taken together mean that while wiretapping is an
+   efficient tool for use in situations where the target of a wiretap is
+   either ignorant or believes himself innocent of wrongdoing,
+   Internet-based wiretapping is a less useful tool than might be
+   imagined against an alerted and technically competent adversary.
+
+6. Security Considerations
+
+   Wiretapping, by definition (see above), releases information that the
+   information sender did not expect to be released.
+
+   This means that a system that allows wiretapping has to contain a
+   function that can be exercised without alerting the information
+   sender to the fact that his desires for privacy are not being met.
+
+   This, in turn, means that one has to design the system in such a way
+   that it cannot guarantee any level of privacy; at the maximum, it can
+   only guarantee it as long as the function for wiretapping is not
+   exercised.
+
+   For instance, encrypted telephone conferences have to be designed in
+   such a way that the participants cannot know to whom any shared
+   keying material is being revealed.
+
+   This means:
+
+   - The system is less secure than it could be had this function not
+     been present.
+
+   - The system is more complex than it could be had this function not
+     been present.
+
+   - Being more complex, the risk of unintended security flaws in the
+     system is larger.
+
+   Wiretapping, even when it is not being exercised, therefore lowers
+   the security of the system.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+IAB & IESG                   Informational                      [Page 7]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+7. Acknowledgements
+
+   This memo is endorsed by the IAB and the IESG.
+
+   Their membership is:
+
+   IAB:
+
+   Harald Alvestrand
+   Randall Atkinson
+   Rob Austein
+   Brian Carpenter
+   Steve Bellovin
+   Jon Crowcroft
+   Steve Deering
+   Ned Freed
+   Tony Hain
+   Tim Howes
+   Geoff Huston
+   John Klensin
+
+
+   IESG:
+
+   Fred Baker
+   Keith Moore
+   Patrik Falstrom
+   Erik Nordmark
+   Thomas Narten
+   Randy Bush
+   Bert Wijnen
+   Rob Coltun
+   Dave Oran
+   Jeff Schiller
+   Marcus Leech
+   Scott Bradner
+   Vern Paxson
+   April Marine
+
+   The number of contributors to the discussion are too numerous to
+   list.
+
+
+
+
+
+
+
+
+
+
+IAB & IESG                   Informational                      [Page 8]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+8. Author's Address
+
+   This memo is authored by the IAB and the IESG.
+
+   The chairs are:
+
+   Fred Baker, IETF Chair
+   519 Lado Drive
+   Santa Barbara California 93111
+
+   Phone: +1-408-526-4257
+   EMail: fred@cisco.com
+
+
+   Brian E. Carpenter, IAB Chair
+   IBM
+   c/o iCAIR
+   Suite 150
+   1890 Maple Avenue
+   Evanston IL 60201
+   USA
+
+   EMail: brian@icair.org
+
+9. References
+
+   [RFC 1984]  IAB and IESG, "IAB and IESG Statement on Cryptographic
+               Technology and the Internet", RFC 1984, August 1996.
+
+
+
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+IAB & IESG                   Informational                      [Page 9]
+
+RFC 2804               IETF Policy on Wiretapping               May 2000
+
+
+9. Full Copyright Statement
+
+   Copyright (C) The Internet Society (2000).  All Rights Reserved.
+
+   This document and translations of it may be copied and furnished to
+   others, and derivative works that comment on or otherwise explain it
+   or assist in its implementation may be prepared, copied, published
+   and distributed, in whole or in part, without restriction of any
+   kind, provided that the above copyright notice and this paragraph are
+   included on all such copies and derivative works.  However, this
+   document itself may not be modified in any way, such as by removing
+   the copyright notice or references to the Internet Society or other
+   Internet organizations, except as needed for the purpose of
+   developing Internet standards in which case the procedures for
+   copyrights defined in the Internet Standards process must be
+   followed, or as required to translate it into languages other than
+   English.
+
+   The limited permissions granted above are perpetual and will not be
+   revoked by the Internet Society or its successors or assigns.
+
+   This document and the information contained herein is provided on an
+   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
+   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
+   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
+   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
+   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+
+Acknowledgement
+
+   Funding for the RFC Editor function is currently provided by the
+   Internet Society.
+
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+IAB & IESG                   Informational                     [Page 10]
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