Difference between revisions of "BLAKE"
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| impossible differential || permutation || 384,512 || 6 rounds || - || - || [http://eprint.iacr.org/2010/043.pdf Aumasson,Guo,Knellwolf,Matusiewicz,Meier] | | impossible differential || permutation || 384,512 || 6 rounds || - || - || [http://eprint.iacr.org/2010/043.pdf Aumasson,Guo,Knellwolf,Matusiewicz,Meier] | ||
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| − | | near-collision || compression function || 256 || 4 rounds (nb. 6 | + | | near-collision || compression function || 256 || 4 rounds (nb. 3-6) || 2<sup>56</sup> || - || [http://www.jguo.org/docs/blake-col.pdf Guo,Matusiewicz] |
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| free-start collision || hash || 224,256 || 2.5 rounds || 2<sup>n/2-16</sup> || - || [http://eprint.iacr.org/2009/238.pdf Ji,Liangyu] | | free-start collision || hash || 224,256 || 2.5 rounds || 2<sup>n/2-16</sup> || - || [http://eprint.iacr.org/2009/238.pdf Ji,Liangyu] | ||
Revision as of 10:35, 6 May 2010
1 The algorithm
- Author(s): Jean-Philippe Aumasson, Luca Henzen, Willi Meier, Raphael C.-W. Phan
- Website: http://131002.net/blake/
- NIST submission package:
- round 1/2: BLAKE_Round2.zip (old versions: BLAKE.zip, BLAKEUpdate.zip)
Jean-Philippe Aumasson, Luca Henzen, Willi Meier, Raphael C.-W. Phan - SHA-3 proposal BLAKE
- ,2008
- http://131002.net/blake/blake.pdf
BibtexAuthor : Jean-Philippe Aumasson, Luca Henzen, Willi Meier, Raphael C.-W. Phan
Title : SHA-3 proposal BLAKE
In : -
Address :
Date : 2008
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: 10 rounds (n=224,256); 14 rounds (n=384,512)
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 |
| preimage | 224,256 | 2.5 rounds | 2n-15 | - | Ji,Liangyu |
| preimage | 384 | 2.5 rounds | 2355 | - | Ji,Liangyu |
| preimage | 512 | 2.5 rounds | 2481 | - | Ji,Liangyu |
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 |
| impossible differential | permutation | 224,256 | 5 rounds | - | - | Aumasson,Guo,Knellwolf,Matusiewicz,Meier |
| impossible differential | permutation | 384,512 | 6 rounds | - | - | Aumasson,Guo,Knellwolf,Matusiewicz,Meier |
| near-collision | compression function | 256 | 4 rounds (nb. 3-6) | 256 | - | Guo,Matusiewicz |
| free-start collision | hash | 224,256 | 2.5 rounds | 2n/2-16 | - | Ji,Liangyu |
| free-start collision | hash | 384,512 | 2.5 rounds | 2n/2-32 | - | Ji,Liangyu |
Jean-Philippe Aumasson, Jian Guo, Simon Knellwolf, Krystian Matusiewicz, Willi Meier - Differential and invertibility properties of BLAKE (full version)
- ,2010
- http://eprint.iacr.org/2010/043.pdf
BibtexAuthor : Jean-Philippe Aumasson, Jian Guo, Simon Knellwolf, Krystian Matusiewicz, Willi Meier
Title : Differential and invertibility properties of BLAKE (full version)
In : -
Address :
Date : 2010
Jian Guo, Krystian Matusiewicz - Round-Reduced Near-Collisions of BLAKE-32
- ,2009
- http://www.jguo.org/docs/blake-col.pdf
BibtexAuthor : Jian Guo, Krystian Matusiewicz
Title : Round-Reduced Near-Collisions of BLAKE-32
In : -
Address :
Date : 2009
Li Ji, Xu Liangyu - Attacks on Round-Reduced BLAKE
