Difference between revisions of "Fugue"

From The ECRYPT Hash Function Website
m (typo)
(Added Aumasson/Phan distinguisher of output transformation)
Line 58: Line 58:
 
|- style="background:#efefef;"                   
 
|- style="background:#efefef;"                   
 
| Type of Analysis || Hash Function Part || Hash Size (n) || Parameters/Variants || Compression Function Calls || Memory Requirements ||  Reference  
 
| Type of Analysis || Hash Function Part || Hash Size (n) || Parameters/Variants || Compression Function Calls || Memory Requirements ||  Reference  
 +
|-                 
 +
| distinguisher<sup>(1)</sup> || output transformation || 256 ||    || 1  || - || [http://ehash.iaik.tugraz.at/uploads/c/cd/Fugue_path.pdf Aumasson,Phan]
 
|-                   
 
|-                   
 
| internal collision || hash function || 256 || (2,5,13)  || 2<sup>352</sup>  || 2<sup>352</sup> || [http://cryptolux.org/mediawiki/uploads/9/99/Struct2.pdf Khovratovich]
 
| internal collision || hash function || 256 || (2,5,13)  || 2<sup>352</sup>  || 2<sup>352</sup> || [http://cryptolux.org/mediawiki/uploads/9/99/Struct2.pdf Khovratovich]
Line 64: Line 66:
 
|-                     
 
|-                     
 
|}
 
|}
 +
<sup>(1)</sup>The Fugue team commented on these distinguishers in [http://ehash.iaik.tugraz.at/uploads/d/d7/Fugue_designers_reply_to_AumassonPhan_Distinguisher.txt this note] using [http://ehash.iaik.tugraz.at/uploads/c/c8/Fig7.pdf this figure].
 +
 +
 +
<bibtex>
 +
@misc{nistAP10,
 +
    author = {Jean-Philippe Aumasson and Raphael C.-W. Phan},
 +
    title = {Analysis of Fugue-256},
 +
    howpublished = {Posting to NIST hash mailing list},
 +
    year = {2010},
 +
    url = {http://ehash.iaik.tugraz.at/uploads/c/cd/Fugue_path.pdf},
 +
    abstract = {We would like to report our analysis results on the final round algorithm of
 +
Fugue-256 (i.e., the function called "G"):
 +
 +
The attached pdf note shows an example differential characteristic of
 +
probability 1, on 15 intermediate rounds of G, as well as an extended
 +
characteristic that can be used as a distinguisher for the full
 +
18-round G. It also shows how differences propagate on an
 +
augmented-round version of G (i.e. if more G2 rounds were added).
 +
 +
A detailed analysis as well as further observations will be reported
 +
in a subsequent paper.
 +
},
 +
}
 +
</bibtex>
 +
  
  

Revision as of 12:10, 21 June 2010

1 The algorithm


Shai Halevi, William E. Hall, Charanjit S. Jutla - The Hash Function Fugue

,2009
http://domino.research.ibm.com/comm/research_projects.nsf/pages/fugue.index.html/$FILE/fugue_09.pdf
Bibtex
Author : Shai Halevi, William E. Hall, Charanjit S. Jutla
Title : The Hash Function Fugue
In : -
Address :
Date : 2009

Shai Halevi, William E. Hall, Charanjit S. Jutla - The Hash Function Fugue

,2008
http://domino.research.ibm.com/comm/research_projects.nsf/pages/fugue.index.html/$FILE/NIST-submission-Oct08-fugue.pdf
Bibtex
Author : Shai Halevi, William E. Hall, Charanjit S. Jutla
Title : The Hash Function Fugue
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 parameters: (k,r,t) = (2,5,13) for (n=224,256); (k,r,t) = (3,5,13) for (n=384); (k,r,t) = (4,8,13) for (n=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(1) output transformation 256 1 - Aumasson,Phan
internal collision hash function 256 (2,5,13) 2352 2352 Khovratovich
internal collision hash function 512 (4,8,13) 2480 2480 Khovratovich

(1)The Fugue team commented on these distinguishers in this note using this figure.


Jean-Philippe Aumasson, Raphael C.-W. Phan - Analysis of Fugue-256

,2010
http://ehash.iaik.tugraz.at/uploads/c/cd/Fugue_path.pdf
Bibtex
Author : Jean-Philippe Aumasson, Raphael C.-W. Phan
Title : Analysis of Fugue-256
In : -
Address :
Date : 2010


Dmitry Khovratovich - Cryptanalysis of hash functions with structures

,2009
http://cryptolux.org/mediawiki/uploads/9/99/Struct2.pdf
Bibtex
Author : Dmitry Khovratovich
Title : Cryptanalysis of hash functions with structures
In : -
Address :
Date : 2009