Difference between revisions of "SHA-256/224"

Revision as of 07:59, 11 March 2008

Hirotaka Yoshida, Alex Biryukov - Analysis of a SHA-256 Variant

Selected Areas in Cryptography 3897:245-260,2005

Author : Hirotaka Yoshida, Alex Biryukov
Title : Analysis of a SHA-256 Variant
In : Selected Areas in Cryptography -
Address :
Date : 2005

Henri Gilbert, Helena Handschuh - Security Analysis of SHA-256 and Sisters

Selected Areas in Cryptography 3006:175-193,2003

Author : Henri Gilbert, Helena Handschuh
Title : Security Analysis of SHA-256 and Sisters
In : Selected Areas in Cryptography -
Address :
Date : 2003

@@ Line 19: / Line 19: @@
 === Collision Attacks ===
-</bibtex>
-@inproceedings{sacryptYoshidaB05,
-  author    = {Hirotaka Yoshida and Alex Biryukov},
-  title     = {Analysis of a SHA-256 Variant},
-  booktitle = {Selected Areas in Cryptography},
-  year      = {2005},
-  pages     = {245-260},
-  url        = {http://dx.doi.org/10.1007/11693383_17},
-  editor    = {Bart Preneel and Stafford E. Tavares},
-  publisher = {Springer},
-  series    = {LNCS},
-  volume    = {3897},
-  isbn      = {3-540-33108-5},
-  abstract  = {SHA-256 is a cryptographic hash function which was proposed in 2000 as a new generation of SHA functions and was adopted as FIPS standard in 2002. In this paper we will consider a SHA-256 variant and a SHACAL-2 variant in which every arithmetic addition is replaced by XOR operation. We call the SHA-256 variant SHA-2-XOR and the SHACAL-2 variant SHACAL-2-XOR respectively. We will present a differential attack on these constructions by using one-round iterative differential characteristics with probability 2^{-8} we identified. Our result shows that SHACAL-2-XOR with up to 31 rounds out of 64 has a weakness of randomness and that SHA-2-XOR with up to 34 rounds has a weakness of pseudo-collision resistance. Using the 31-round distinguisher, we present an attack on SHACAL-2-XOR with up to 32 rounds. We also show that no 2-round iterative patterns with probability higher than 2^{-16} exist.},
-}
-</bibtex>
 <bibtex>