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Network Working Group                                           d. bider
Internet-Draft                                           Bitvise Limited
Expires: October 10, 2011                                  April 8, 2011

 SHA-2 Data Integrity Verification for the Secure Shell (SSH) Transport
                             Layer Protocol


   This memo defines algorithm names and parameters for use of SHA-2 for
   data integrity verification in the Secure Shell (SSH) protocol.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on October 10, 2011.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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1.  Overview and Rationale

   SSH [RFC4251] is a very common protocol for secure remote login on
   the Internet.  Currently, SSH defines data integrity verification
   using SHA-1 and MD5 algorithms [RFC4253].  Due to recent security
   concerns with these two algorithms, implementors and users request
   support for data integrity verification using SHA-2.

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2.  Data Integrity Algorithms

   This memo adopts the style and conventions of [RFC4253] in defining
   new data integrity algorithms.

   The following new data integrity algorithms are defined:

   hmac-sha2-256     OPTIONAL  HMAC-SHA2-256
                               (digest length = key length = 32)
   hmac-sha2-256-96  OPTIONAL  first 96 bits of HMAC-SHA2-256
                               (digest length = 12,
                                key length = 32)
   hmac-sha2-512     OPTIONAL  HMAC-SHA2-512
                               (digest length = key length = 64)
   hmac-sha2-512-96  OPTIONAL  first 96 bits of HMAC-SHA2-512
                               (digest length = 12,
                                key length = 64)

                                 Figure 1

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3.  References

              National Institute of Standards and Technology (NIST),
              "Secure Hash Standard (SHS)", FIPS PUB 180-2, August 2002.

   [RFC4251]  Ylonen, T. and C. Lonvick, "The Secure Shell (SSH)
              Protocol Architecture", RFC 4251, January 2006.

   [RFC4253]  Ylonen, T. and C. Lonvick, "The Secure Shell (SSH)
              Transport Layer Protocol", RFC 4253, January 2006.

bider                   Expires October 10, 2011                [Page 4]

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Author's Address

   denis bider
   Bitvise Limited
   Suites 41/42, Victoria House
   26 Main Street

   Phone: +1 869 762 1410
   Email: hmac-sha2-256@bitvise.com
   URI:   http://www.bitvise.com/

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