Difference between revisions of "SHA-256/224"
From The ECRYPT Hash Function Website
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=== Collision Attacks === | === Collision Attacks === | ||
| + | |||
| + | <bibtex> | ||
| + | @inproceedings{iswSanadhyaS08, | ||
| + | author = {Somitra Kumar Sanadhya and Palash Sarkar}, | ||
| + | title = {Deterministic Constructions of 21-Step Collisions for the SHA-2 Hash Family}, | ||
| + | booktitle = {ISC}, | ||
| + | year = {2008}, | ||
| + | pages = {244-259}, | ||
| + | abstract = {Recently, at FSE ’08, Nikolic and Biryukov introduced a new technique for analyzing SHA-2 round function. Building on their work, but using other differential paths, we construct two different deterministic attacks against 21-step SHA-2 hash family. Since the attacks are deterministic, they are actually combinatorial constructions of collisions. There are six free words in our first construction. This gives exactly 2^192 different collisions for 21-step SHA-256 and exactly 2^384 different collisions for 21-step SHA-512. The second construction has five free words. The best previous result, due to Nikolic and Biryukov, for finding collisions for 21-step SHA-256 holds with probability 2-^19. No results on 21-step SHA-512 are previously known. Further, we provide evidence that the Nikolic-Biryukov differential path is unlikely to yield 21-step collisions for SHA-512.}, | ||
| + | url = {http://dx.doi.org/10.1007/978-3-540-85886-7_17}, | ||
| + | editor = {Tzong-Chen Wu and Chin-Laung Lei and Vincent Rijmen and Der-Tsai Lee}, | ||
| + | publisher = {Springer}, | ||
| + | series = {LNCS}, | ||
| + | volume = {5222}, | ||
| + | isbn = {978-3-540-85884-3}, | ||
| + | } | ||
| + | </bibtex> | ||
<bibtex> | <bibtex> | ||
Revision as of 14:36, 10 November 2008
Contents
1 Specification
- digest size: 256 bits
- max. message length: < 264 bits
- compression function: 512-bit message block, 256-bit chaining variable
- Specification: FIPS 180-2 Secure Hash Standard
2 Cryptanalysis
2.1 Best Known Results
Collision attacks up to 21 out of 64 steps. Other non random behavior up to 25 steps. Both results are due to Nicolic and Biryukov.
2.2 Generic Attacks
2.3 Collision Attacks
Somitra Kumar Sanadhya, Palash Sarkar - Deterministic Constructions of 21-Step Collisions for the SHA-2 Hash Family
- ISC 5222:244-259,2008
- http://dx.doi.org/10.1007/978-3-540-85886-7_17
BibtexAuthor : Somitra Kumar Sanadhya, Palash Sarkar
Title : Deterministic Constructions of 21-Step Collisions for the SHA-2 Hash Family
In : ISC -
Address :
Date : 2008
Somitra Kumar Sanadhya, Palash Sarkar - Non-linear Reduced Round Attacks against SHA-2 Hash Family
- ACISP 5107:254-266,2008
- http://dx.doi.org/10.1007/978-3-540-70500-0_19
BibtexAuthor : Somitra Kumar Sanadhya, Palash Sarkar
Title : Non-linear Reduced Round Attacks against SHA-2 Hash Family
In : ACISP -
Address :
Date : 2008
Ivica Nikolic, Alex Biryukov - Collisions for Step-Reduced SHA-256
- FSE 5086:1-15,2008
- http://dx.doi.org/10.1007/978-3-540-71039-4_1
BibtexAuthor : Ivica Nikolic, Alex Biryukov
Title : Collisions for Step-Reduced SHA-256
In : FSE -
Address :
Date : 2008
Somitra Kumar Sanadhya, Palash Sarkar - New Local Collisions for the SHA-2 Hash Family
- ICISC 4817:193-205,2007
- http://dx.doi.org/10.1007/978-3-540-76788-6_16
BibtexAuthor : Somitra Kumar Sanadhya, Palash Sarkar
Title : New Local Collisions for the SHA-2 Hash Family
In : ICISC -
Address :
Date : 2007
Florian Mendel, Norbert Pramstaller, Christian Rechberger, Vincent Rijmen - Analysis of Step-Reduced SHA-256
- FSE 4047:126-143,2006
- http://dx.doi.org/10.1007/11799313_9
BibtexAuthor : Florian Mendel, Norbert Pramstaller, Christian Rechberger, Vincent Rijmen
Title : Analysis of Step-Reduced SHA-256
In : FSE -
Address :
Date : 2006
Hirotaka Yoshida, Alex Biryukov - Analysis of a SHA-256 Variant
- Selected Areas in Cryptography 3897:245-260,2005
- http://dx.doi.org/10.1007/11693383_17
BibtexAuthor : 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
- http://springerlink.metapress.com/openurl.asp?genre=article{\&}issn=0302-9743{\&}volume=3006{\&}spage=175
BibtexAuthor : Henri Gilbert, Helena Handschuh
Title : Security Analysis of SHA-256 and Sisters
In : Selected Areas in Cryptography -
Address :
Date : 2003
