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SMASH (hash)

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SMASH
General
DesignersLars R. Knudsen
First published2005
Detail
Digest sizes256 or 512 bits
Best public cryptanalysis
Collision,[1] Second Preimage[2]

SMASH is a cryptographic hash function which was created by Lars R. Knudsen.[3] SMASH comes in two versions: 256-bit and 512-bit. Each version was supposed to rival SHA-256 and SHA-512, respectively, however, shortly after the SMASH presentation at FSE 2005, an attack vector against SMASH was discovered which left the hash broken.

Specifications

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The message length was limited to less than 2128 for SMASH-256 and 2256 for SMASH-512.

Definition

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Input: 256/512-bit message blocks and

The function f is a complex compression function consisting of H-Rounds and L-Rounds using S-boxes, linear diffusion and variable rotations, details can be found here [3]

Details

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The S-boxes in SMASH are derived versions from the Serpent ones.

References

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  1. ^ Pramstaller, Norbert; Rechberger, Christian; Rijmen, Vincent (2006). "Breaking a New Hash Function Design Strategy Called SMASH". Selected Areas in Cryptography. Lecture Notes in Computer Science. Vol. 3897. pp. 233–244. doi:10.1007/11693383_16. ISBN 978-3-540-33108-7.
  2. ^ Lamberger, Mario; Pramstaller, Norbert; Rechberger, Christian; Rijmen, Vincent (2006). "Second Preimages for SMASH". Topics in Cryptology – CT-RSA 2007. Lecture Notes in Computer Science. Vol. 4377. pp. 101–111. doi:10.1007/11967668_7. ISBN 978-3-540-69327-7.
  3. ^ a b Knudsen, Lars R.: SMASH - A Cryptographic Hash Function, Accessed 23 November 2009