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{{Infobox cryptographic hash function
| name          = SMASH
| image          =
| caption        =
<!-- General -->
| designers      = [[Lars R. Knudsen]]
| publish date  = 2005
| series        =
| derived from  =
| derived to    =
| related to    =
| certification  =
<!-- Detail -->
| digest size    = 256 or 512 bits
| structure      =
| rounds        =
| cryptanalysis  = Collision,<ref>{{cite journal|last1=Pramstaller|first1=Norbert|last2=Rechberger|first2=Christian|last3=Rijmen|first3=Vincent|year=2006|title=Breaking a New Hash Function Design Strategy Called SMASH|journal=Lecture Notes in Computer Science|volume=3897|pages=233–244|url=http://www.springerlink.com/content/95k3571g670m770v/|doi=10.1007/11693383_16}}</ref> Second Preimage<ref>{{cite journal|last1=Lamberger|first1=Mario|last2=Pramstaller|first2=Norbert|last3=Rechberger|first3=Christian|last4=Rijmen|first4=Vincent|year=2006|title=Second Preimages for SMASH|journal=Lecture Notes in Computer Science|volume=4377|pages=101–111|url=http://www.springerlink.com/content/x57511871q127628/|doi=10.1007/11967668_7}}</ref>
}}


'''SMASH''' is a [[cryptographic hash function]] which was created by [[Lars R. Knudsen]].<ref name="knudsen">Knudsen, Lars R.: [http://www.iacr.org/archive/fse2005/35570226/35570226.pdf SMASH - A Cryptographic Hash Function], Accessed 23 November 2009</ref>  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 2<sup>128</sup> for SMASH-256 and 2<sup>256</sup> for SMASH-512.
 
== Definition ==
 
Input: 256/512-bit message blocks <math>m_1, m_2, ... ,m_t</math> and <math>\theta \in GF(2^n)</math>
 
* <math> h_0 = f(iv) \oplus iv </math>
* <math> h_i = h(h_{i-1},m_i) = f(h_{i_1}\oplus m_i) \oplus m_i \oplus \theta m_i</math>
* <math> h_{t+1} = f(h_t) \oplus h_t </math>
 
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 <ref name="knudsen" />
 
== Details ==
The [[S-boxes]] in SMASH are derived versions from the [[Serpent (cipher)|Serpent]] ones.
 
== References ==
<references/>
 
{{Cryptography navbox | hash}}
 
[[Category:Cryptographic hash functions]]
 
 
{{crypto-stub}}

Revision as of 15:44, 19 February 2014


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