MUST implement AES-CBC for IPsec ESP

[Russ Housley <housley at vigilsec.com>]

During the IETF Last Call for draft-manral-ipsec-rfc4305-bis-errata, 
we received a comment that deserves wide exposure.

For ESP encryption algorithms, the document that was sent out for 
Last Call contains the following table:

      Requirement    Encryption Algorithm (notes)
      -----------    --------------------
      MUST           NULL (1)
      MUST-          TripleDES-CBC [RFC2451]
      SHOULD+        AES-CBC with 128-bit keys [RFC3602]
      SHOULD         AES-CTR [RFC3686]
      SHOULD NOT     DES-CBC [RFC2405] (3)

The Last Call comment suggests changing the "SHOULD+" for AES-CBC to "MUST."

I support this proposed change, and I have asked the author to make 
this change in the document that will be submitted to the IESG for 
consideration on the Telechat on January 25th.  If anyone has an 
objection to this change, please speak now.  Please send comments on 
this proposed change to the iesg at ietf.org or ietf at ietf.org mailing 
lists by 2007-01-24.

Russ Housley
Security AD


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