SHA-256/224

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

• Generic Attacks on the Merkle-Damgaard Construction

---

2.3 Collision Attacks

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
Bibtex

Author : 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
Bibtex

Author : 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
Bibtex

Author : 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
Bibtex

Author : 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
Bibtex

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

http://springerlink.metapress.com/openurl.asp?genre=article{\&}issn=0302-9743{\&}volume=3006{\&}spage=175
Bibtex

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

---

---

---