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Protocol Action: The AES-XCBC-MAC-96 Algorithm and Its Use With IPsec to Proposed Standard

The IESG has approved "The AES-XCBC-MAC-96 Algorithm and Its Use With
IPsec" <draft-ietf-ipsec-ciph-aes-xcbc-mac-04.txt> as a Proposed
Standard.  This document is the product of the IPsec Working Group.  
The IESG contact persons are Steve Bellovin and Russ Housley.

Technical Summary

This document defines a new hash algorithm for use in IPsec ESP. It
is a variant of the traditional use of a cipher in Cipher Block
Chaining (CBC) Mode to compute a hash value. However traditional CBC
mode hashes are vulnerable to attack if the amount of data to be
protected is of variable length. This document defines a variant of
this approach, applied to the Advanced Encryption Standard (AES)
that is proof against this vulnerability.

Working Group Summary

There was working group consensus on this document.

Protocol Quality

These documents were reviewed by Jeff Schiller.