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<p class="MsoNormal">We held a session on encryption for JSON Web Tokens at IIW (Wednesday after lunch in space E), building upon the results from the
<a href="http://self-issued.info/?p=361">JSON Tokens</a> and <a href="http://iiw.idcommons.net/No_Base_String">
No Base String</a> sessions on Tuesday. Once again, substantial consensus emerged, which is described in the notes below.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">These consensus decisions were in place by the start of the session:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Some use cases for JSON tokens require encryption<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>(plus all the decisions from the sessions on Tuesday)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It was agreed that these sets of high-level goals need to be achievable by application of signing and/or encryption:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo5"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Integrity<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo5"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Confidentiality + Integrity<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo5"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Non-Repudiation (which also implies Integrity)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l6 level1 lfo5"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Non-Repudiation + Confidentiality<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Open issues identified at the start of the session were:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Should encryption and signing be accomplished via (1) separate but composable encryption and signing operations, (2) use of a small set of recommended composite operations that achieve the high-level goals, or (3) allowing for
both possibilities?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Data format and how data formats affect streaming operations<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Order of signing and encryption operations<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Compress before encrypt?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>What are we encrypting (payload or payload + signature)?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The primary consensus in the room was to<b> invent as little as possible by reusing work</b> that other experts have done in the space, while adapting their work to a JSON context. Participants provided the following references to work
to borrow from:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Cryptographic Message Syntax (CMS): <a href="http://tools.ietf.org/html/rfc5652">
http://tools.ietf.org/html/rfc5652</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Table of Algorithm Suites from WS-SecurityPolicy 1.2, section 6.1:
<a href="http://docs.oasis-open.org/ws-sx/ws-securitypolicy/200702/ws-securitypolicy-1.2-spec-os.html#_Toc161826547">
http://docs.oasis-open.org/ws-sx/ws-securitypolicy/200702/ws-securitypolicy-1.2-spec-os.html#_Toc161826547</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>XML Signature Syntax and Processing (Second Edition):
<a href="http://www.w3.org/TR/xmldsig-core/">http://www.w3.org/TR/xmldsig-core/</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>XML Encryption Syntax and Processing: <a href="http://www.w3.org/TR/xmlenc-core/">
http://www.w3.org/TR/xmlenc-core/</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Defective Sign and Encrypt analysis: <a href="http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.PDF">
http://world.std.com/~dtd/sign_encrypt/sign_encrypt7.PDF</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The TLS Protocol Version 1.0: <a href="http://tools.ietf.org/html/rfc2246">
http://tools.ietf.org/html/rfc2246</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Transport Layer Security Protocol Compression Methods:
<a href="http://tools.ietf.org/html/rfc3749">http://tools.ietf.org/html/rfc3749</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Compressed Data Content Type for Cryptographic Message Syntax (CMS):
<a href="http://tools.ietf.org/html/rfc3274">http://tools.ietf.org/html/rfc3274</a><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l7 level1 lfo10"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>DEFLATE Compressed Data Format Specification version 1.3:
<a href="http://tools.ietf.org/html/rfc1951">http://tools.ietf.org/html/rfc1951</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Specific issues were resolved as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b>Should encryption and signing be accomplished via (1) separate but composable encryption and signing operations, (2) use of a small set of recommended composite operations that achieve the high-level goals, or (3) allowing
for both possibilities?<o:p></o:p></b></p>
<p class="MsoNormal">The consensus was for (3) – that we should specify a small set of composite operations that will meet the needs of common use cases, while also enabling applications to compose encryption and signing operations in a general fashion, should
the composite operations prove insufficient for their use cases. A subset of the composite algorithm suites in WS-SecurityPolicy 1.2 was suggested as an appropriate starting point. Paul Tarjan of Facebook had also suggested during the OpenID Summit on Monday
that descriptive composite algorithm values be used, such as “AES-256-CBC HMAC-SHA-256”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b>Data format and how data formats affect streaming operations<o:p></o:p></b></p>
<p class="MsoNormal">For the same reasons as discussed during the signing session, the group reaffirmed that the order of the fields should be envelope.payload.signature, with the envelope containing sufficient information to determine the nature of the contents
of the remaining fields. This order enables streaming operations, where content is created or analyzed in parallel with its transmission or reception, to the maximum extent possible, and also potentially minimizes buffering requirements imposed upon implementations.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b>Order of signing and encryption operations<o:p></o:p></b></p>
<p class="MsoNormal">It was recognized that no one-size-fits-all solution applies here and that different sets of operations are needed for different use cases. For instance, if non-repudiation is required, a signature of the plan text using public key cryptography
must be present, which therefore must precede any other operations. Again, the group reaffirmed that we should reuse other work in this area to the extent possible.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b>Compress before encrypt?<o:p></o:p></b></p>
<p class="MsoNormal">Several participants pointed out existing practice in this area, including the use of the DEFLATE compression algorithm prior to encryption by TLS and CMS. It was agreed that we should similarly document how to optionally perform compression
before encryption for those use cases where it makes sense.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b>What are we encrypting (payload or payload + signature)?<o:p></o:p></b></p>
<p class="MsoNormal">This was another area were the participants felt that we should reuse existing practice that has already been vetted by experts.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Special thanks go to Breno de Medeiros, whose crypto expertise was invaluable during this session, as well as Brad Hill, Diana Smetters and several other Googlers, John Bradley, Nat Sakimura, Joseph Holsten, Thomas Hardjono, Terry Hayes,
Dick Hardt, Tony Nadalin, and others who contributed to this productive session.<o:p></o:p></p>
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