Hamsi

1 The algorithm

• Author(s): Özgül Kücük
• Website: http://homes.esat.kuleuven.be/~okucuk/hamsi/
• NIST submission package:
  • round 1/2: Hamsi_Round2.zip (old versions: Hamsi.zip, HamsiUpdate.zip)

Özgül Kücük - The Hash Function Hamsi

,2009

http://www.cosic.esat.kuleuven.be/publications/article-1203.pdf
Bibtex

Author : Özgül Kücük
Title : The Hash Function Hamsi
In : -
Address :
Date : 2009

Özgül Kücük - The Hash Function Hamsi

,2008

http://ehash.iaik.tugraz.at/uploads/9/95/Hamsi.pdf
Bibtex

Author : Özgül Kücük
Title : The Hash Function Hamsi
In : -
Address :
Date : 2008

2 Cryptanalysis

We distinguish between two cases: results on the complete hash function, and results on underlying building blocks.

2.1 Hash function

Here we list results on the actual hash function. The only allowed modification is to change the security parameter.

Recommended security parameters: (3,6) P,P_f rounds (n=224,256); (6,12) P,P_f rounds (n=384,512)

2.2 Building blocks

Here we list results on underlying building blocks, and the hash function modified by other means than the security parameter.

Note that these results assume more direct control or access over some internal variables (aka. free-start, pseudo, compression function, block cipher, or permutation attacks).

Type of Analysis	Hash Function Part	Hash Size (n)	Parameters/Variants	Compression Function Calls	Memory Requirements	Reference
non-randomness	compression function	224, 256	5 rounds			Aumasson
near-collision	compression function	224, 256	3 rounds	221		Nikolic
distinguisher	compression function	224, 256	6 rounds	227		Aumasson,Meier
distinguisher	compression function	384, 512	12 rounds	2729		Aumasson,Meier
near-collision	compression function	224, 256	3 rounds	25		Wang,Wang,Jia,Wang
near-collision	compression function	224, 256	4 rounds	232		Wang,Wang,Jia,Wang
near-collision	compression function	224, 256	5 rounds	2125		Wang,Wang,Jia,Wang

A description of this table is given here.

Jean-Philippe Aumasson - On the pseudorandomness of Hamsi

,2009

http://ehash.iaik.tugraz.at/uploads/d/db/Hamsi_nonrandomness.txt
Bibtex

Author : Jean-Philippe Aumasson
Title : On the pseudorandomness of Hamsi
In : -
Address :
Date : 2009

Ivica Nikolic - Near Collisions for the Compression Function of Hamsi-256

,2009

http://rump2009.cr.yp.to/936779b3afb9b48a404b487d6865091d.pdf
Bibtex

Author : Ivica Nikolic
Title : Near Collisions for the Compression Function of Hamsi-256
In : -
Address :
Date : 2009

Jean-Philippe Aumasson, Willi Meier - Zero-sum distinguishers for reduced Keccak-f and for the core functions of Luffa and Hamsi

,2009

http://www.131002.net/data/papers/AM09.pdf
Bibtex

Author : Jean-Philippe Aumasson, Willi Meier
Title : Zero-sum distinguishers for reduced Keccak-f and for the core functions of Luffa and Hamsi
In : -
Address :
Date : 2009

Meiqin Wang, Xiaoyun Wang, Keting Jia, Wei Wang - New Pseudo-Near-Collision Attack on Reduced-Round of Hamsi-256

,2009

http://eprint.iacr.org/2009/484.pdf
Bibtex

Author : Meiqin Wang, Xiaoyun Wang, Keting Jia, Wei Wang
Title : New Pseudo-Near-Collision Attack on Reduced-Round of Hamsi-256
In : -
Address :
Date : 2009