MD6

The MD6 Message-Digest Algorithm is a cryptographic hash function. It uses a Merkle tree-like structure to allow for immense parallel computation of hashes for very long inputs. Authors claim a performance of 28 cycles per byte for MD6-256 on an Intel Core 2 Duo and provable resistance against differential cryptanalysis.[2] The source code of the reference implementation was released under MIT license.[3]

For other uses, see MD-6 (disambiguation).
MD6
General
DesignersRonald Rivest, Benjamin Agre, Dan Bailey, Sarah Cheng, Christopher Crutchfield, Yevgeniy Dodis, Kermin Fleming, Asif Khan, Jayant Krishnamurthy, Yuncheng Lin, Leo Reyzin, Emily Shen, Jim Sukha, Eran Tromer, Yiqun Lisa Yin
First published2008
SeriesMD2, MD4, MD5, MD6
Detail
Digest sizesVariable, 0<d≤512 bits
StructureMerkle tree
RoundsVariable. Default, Unkeyed=40+[d/4], Keyed=max(80,40+(d/4)) [1]

Speeds in excess of 1 GB/s have been reported to be possible for long messages on 16-core CPU architecture.[1]

In December 2008, Douglas Held of Fortify Software discovered a buffer overflow in the original MD6 hash algorithm's reference implementation. This error was later made public by Ron Rivest on 19 February 2009, with a release of a corrected reference implementation in advance of the Fortify Report.[4]

MD6 was submitted to the NIST SHA-3 competition. However, on July 1, 2009, Rivest posted a comment at NIST that MD6 is not yet ready to be a candidate for SHA-3 because of speed issues, a "gap in the proof that the submitted version of MD6 is resistant to differential attacks", and an inability to supply such a proof for a faster reduced-round version,[5] although Rivest also stated at the MD6 website that it is not withdrawn formally.[6] MD6 did not advance to the second round of the SHA-3 competition. In September 2011, a paper presenting an improved proof that MD6 and faster reduced-round versions are resistant to differential attacks[7] was posted to the MD6 website.[8]

See also

References
  1. Ronald L. Rivest et Al., The MD6 Hash Function, Crypto 2008
  2. Ronald L. Rivest. "The MD6 hash function A proposal to NIST for SHA-3". (Microsoft PowerPoint file)
  3. readme.txt
  4. "Fortify-SHA-3-Report" (PDF). Archived from the original (PDF) on 2012-02-22.
  5. Rivest, Ronald (July 1, 2009). "OFFICIAL COMMENT: MD6". Retrieved September 27, 2011.
  6. Schneier, Bruce (July 1, 2009). "MD6 Withdrawn from SHA-3 Competition". Retrieved July 9, 2009.
  7. Heilman, Ethan (July 10, 2011). "Restoring the Differential Resistance of MD6". Retrieved September 27, 2011.
  8. Heilman, Ethan (September 2011). "Improved Differential Analysis". Retrieved September 27, 2011.
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