Skein

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Contents

1 The algorithm


Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker - The Skein Hash Function Family
Submission to NIST (Round 3), 2010
[Electronic Edition] [Bibtex]
Author : Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker
Title : The Skein Hash Function Family
In : Submission to NIST (Round 3) -

Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker - The Skein Hash Function Family
Submission to NIST (Round 2), 2009
[Electronic Edition] [Bibtex]
Author : Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker
Title : The Skein Hash Function Family
In : Submission to NIST (Round 2) -

Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker - The Skein Hash Function Family
Submission to NIST (Round 1), 2008
[Electronic Edition] [Bibtex]
Author : Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker
Title : The Skein Hash Function Family
In : Submission to NIST (Round 1) -

2 Cryptanalysis

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

A description of the tables is given here.

Recommended security parameter: 72 rounds (Skein-512)


2.1 Hash function

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

Type of Analysis Hash Size (n) Parameters Compression Function Calls Memory Requirements Reference


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
distinguisher compression function all 57 rounds (Round 2) 2503 - Khovratovich,Nikolić,Rechberger
distinguisher compression function 256 53 rounds (Round 2) 2251, Skein-256 - Khovratovich,Nikolić,Rechberger
near-collision compression function all 24 rounds (No. 20-43) 2230 - Su,Wu,Wu,Dong
near-collision compression function 256 24 rounds (No. 12-35), Skein-256 260 - Su,Wu,Wu,Dong
near-collision compression function all 24 rounds, Skein-1024 2395 - Su,Wu,Wu,Dong
observations hash all Gligoroski
observations block cipher all - - - McKay,Vora
observations compression function all - - - Kaminsky
key recovery block cipher 256 39 rounds 2254.1 - Khovratovich,Nikolic
key recovery block cipher 512 42 rounds 2507 - Khovratovich,Nikolic
key recovery block cipher 512 32 rounds (Round 1) 2226 (2222) 212 Chen,Jia
key recovery block cipher 512 33 rounds (Round 1) 2352.17 (2355.5) - Chen,Jia
near collision compression function 512 17 rounds (Round 1) 224 - Aumasson,Calik,Meier,Ozen,Phan,Varici
distinguisher block cipher 512 35 rounds (Round 1) 2478 - Aumasson,Calik,Meier,Ozen,Phan,Varici
impossible differential block cipher 512 21 rounds (Round 1) - - Aumasson,Calik,Meier,Ozen,Phan,Varici
key recovery block cipher 512 32 rounds (Round 1) 2312 - Aumasson,Calik,Meier,Ozen,Phan,Varici


Dmitry Khovratovich, Ivica Nikolić, Christian Rechberger - Rotational Rebound Attacks on Reduced Skein
In Proceedings of ASIACRYPT, LNCS 6477, pp. 1-19, Springer, 2010
[Electronic Edition] [Bibtex]
Author : Dmitry Khovratovich, Ivica Nikolić, Christian Rechberger
Title : Rotational Rebound Attacks on Reduced Skein
In : In Proceedings of ASIACRYPT -
[Abstract]

Bozhan Su, Wenling Wu, Shuang Wu, Le Dong - Near-Collisions on the Reduced-Round Compression Functions of Skein and BLAKE
In Proceedings of CANS, LNCS 6467, pp. 124-139, Springer, 2010
[Electronic Edition] [Bibtex]
Author : Bozhan Su, Wenling Wu, Shuang Wu, Le Dong
Title : Near-Collisions on the Reduced-Round Compression Functions of Skein and BLAKE
In : In Proceedings of CANS -
[Abstract]

Danilo Gligoroski - Narrow-pipe SHA-3 candidates differ significantly from ideal random functions defined over big domains
NIST mailing list, 2010
[Electronic Edition] [Bibtex]
Author : Danilo Gligoroski
Title : Narrow-pipe SHA-3 candidates differ significantly from ideal random functions defined over big domains
In : NIST mailing list -

Kerry A. McKay, Poorvi L. Vora - Pseudo-Linear Approximations for ARX Ciphers: With Application to Threefish
Cryptology ePrint Archive, Report 2010/282, 2010
[Electronic Edition] [Bibtex]
Author : Kerry A. McKay, Poorvi L. Vora
Title : Pseudo-Linear Approximations for ARX Ciphers: With Application to Threefish
In : Cryptology ePrint Archive, Report 2010/282 -
[Abstract]

Alan Kaminsky - Cube Test Analysis of the Statistical Behavior of CubeHash and Skein
Cryptology ePrint Archive, Report 2010/262, 2010
[Electronic Edition] [Bibtex]
Author : Alan Kaminsky
Title : Cube Test Analysis of the Statistical Behavior of CubeHash and Skein
In : Cryptology ePrint Archive, Report 2010/262 -
[Abstract]

Dmitry Khovratovich, Ivica Nikolic - Rotational Cryptanalysis of ARX
In Proceedings of FSE, LNCS 6147, pp. 333-346, Springer
[Electronic Edition] [Bibtex]
Author : Dmitry Khovratovich, Ivica Nikolic
Title : Rotational Cryptanalysis of ARX
In : In Proceedings of FSE -
[Abstract]

Jiazhe Chen, Keting Jia - Improved Related-key Boomerang Attacks on Round-Reduced Threefish-512
Cryptology ePrint Archive, Report 2009/526, 2009
[Electronic Edition] [Bibtex]
Author : Jiazhe Chen, Keting Jia
Title : Improved Related-key Boomerang Attacks on Round-Reduced Threefish-512
In : Cryptology ePrint Archive, Report 2009/526 -
[Abstract]

Jean-Philippe Aumasson, Cagdas Calik, Willi Meier, Onur Ozen, Raphael C.-W. Phan, Kerem Varici - Improved Cryptanalysis of Skein
In Proceedings of ASIACRYPT, LNCS 5912, pp. 542-559, Springer, 2009
[Electronic Edition] [Bibtex]
Author : Jean-Philippe Aumasson, Cagdas Calik, Willi Meier, Onur Ozen, Raphael C.-W. Phan, Kerem Varici
Title : Improved Cryptanalysis of Skein
In : In Proceedings of ASIACRYPT -
[Abstract]

Jean-Philippe Aumasson, Willi Meier, Raphael Phan - Improved analyis of Threefish
FSE 2009 rump session, slides available online, 2009
[Electronic Edition] [Bibtex]
Author : Jean-Philippe Aumasson, Willi Meier, Raphael Phan
Title : Improved analyis of Threefish
In : FSE 2009 rump session, slides available online -
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