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OAuth Design Team Call

OAuth Design Team Call. 11 th February 2013. Security Design Requirements. Focus on symmetric key cryptography Use MAC Token spec as a starting point Lifetime of session key = Lifetime of access token Unless the sequence number space wraps Replay protection: Timestamp + [sequence number]

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OAuth Design Team Call

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  1. OAuth Design Team Call 11th February 2013

  2. Security Design Requirements • Focus on symmetric key cryptography • Use MAC Token spec as a starting point • Lifetime of session key = Lifetime of access token • Unless the sequence number space wraps • Replay protection: Timestamp + [sequence number] • Support for TLS channel bindings • Integrity protection for data exchange between the client and the resource server, and vice versa. • “Flexibility” regarding keyed message digest computation • Crypto-Agility: Algorithm indication from Authorization Server to the Client.

  3. Remaining Decisions • Key distribution: • Three mechanisms presented. Which one should focus on? • Key naming: New key identifier (kid) parameter? • Allow Client to indicate to which RS is wants to talk to?

  4. DKIM Signature Recap • body-hash: is the output from hashing the body, using hash-alg. • data-hash: is the output from using the hash-alg algorithm, to hash the header including the DKIM-Signature header, and the body hash. • h-headers: is the list of headers to be signed, as specified in the "h" parameter. • h= Signed header fields • Example: h=Received : From : To : Subject : Date : Message-ID; • Alternative: IANA registration for example

  5. Key Distribution • Three techniques: • Key Transport • “Key Retrieval” • Key Agreement • Key point: What is MTI?

  6. How RS obtains the Session Key?Option#1: Key Transport

  7. How RS obtains the Session Key?Option#2: “Key Retrieval” Key Request

  8. How RS obtains the Session Key?Option#3: Key Agreement Key Request

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