Difference between revisions of "JH"

From The ECRYPT Hash Function Website
m
(Added Rijmen>/Toz/Varici results)
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|  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  
 
|-                                     
 
|-                                     
−
|  | pseudo-collision || compression || all ||  || - || - || [http://ehash.iaik.tugraz.at/uploads/a/a8/Jh1.txt Bagheri]
+
|  semi-free-start collision || hash || 256 || 16 rounds  || 2<sup>178.24</sup> || 2<sup>101.12</sup> || [http://www.cosic.esat.kuleuven.be/publications/article-1431.pdf Rijmen,Toz,Varıcı]
 +
|-                                   
 +
|  semi-free-start near collision || compression function || 256 || 19 rounds  || 2<sup>156.77</sup> || 2<sup>143.70</sup> || [http://www.cosic.esat.kuleuven.be/publications/article-1431.pdf Rijmen,Toz,Varıcı]
 +
|-
 +
|  semi-free-start near collision || compression function || 256 || 22 rounds  || 2<sup>156.56</sup> || 2<sup>143.70</sup> || [http://www.cosic.esat.kuleuven.be/publications/article-1431.pdf Rijmen,Toz,Varıcı]
 +
|-
 +
|  | pseudo-collision || compression function || all ||  || - || - || [http://ehash.iaik.tugraz.at/uploads/a/a8/Jh1.txt Bagheri]
 
|-                     
 
|-                     
 
|  | pseudo-2nd preimage || compression || all ||  || - || - || [http://ehash.iaik.tugraz.at/uploads/a/a8/Jh1.txt Bagheri]
 
|  | pseudo-2nd preimage || compression || all ||  || - || - || [http://ehash.iaik.tugraz.at/uploads/a/a8/Jh1.txt Bagheri]
Line 69: Line 75:
  
  
 +
<bibtex>
 +
@inproceedings{RTV10,
 +
  author    = {Vincent Rijmen and Denis Toz and Kerem Varıcı},
 +
  title    = {Rebound Attack on Reduced-Round Versions of JH},
 +
  url = {http://www.cosic.esat.kuleuven.be/publications/article-1431.pdf},
 +
  booktitle  = {FSE},
 +
  year      = {2010},
 +
  series    = {LNCS},
 +
  note = {To appear}
  
  

Revision as of 14:09, 13 April 2010

1 The algorithm


Hongjun Wu - The Hash Function JH

,2009
http://icsd.i2r.a-star.edu.sg/staff/hongjun/jh/jh_round2.pdf
Bibtex
Author : Hongjun Wu
Title : The Hash Function JH
In : -
Address :
Date : 2009

Hongjun Wu - The Hash Function JH

,2008
http://icsd.i2r.a-star.edu.sg/staff/hongjun/jh/jh.pdf
Bibtex
Author : Hongjun Wu
Title : The Hash Function JH
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.


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.

Recommended security parameter: 35.5 rounds

Type of Analysis Hash Size (n) Parameters Compression Function Calls Memory Requirements Reference
preimage(1) 512 2510.3 (+ 2524 MA + 2524 CMP) 2510.3 (Wu: 2510.6) Mendel,Thomsen, Wu

(1) Wu has analyzed the exact memory requirements, additional memory accesses (MA) and comparisons (CMP) of the attack by Mendel and Thomsen.


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
semi-free-start collision hash 256 16 rounds 2178.24 2101.12 Rijmen,Toz,Varıcı
semi-free-start near collision compression function 256 19 rounds 2156.77 2143.70 Rijmen,Toz,Varıcı
semi-free-start near collision compression function 256 22 rounds 2156.56 2143.70 Rijmen,Toz,Varıcı
pseudo-collision compression function all - - Bagheri
pseudo-2nd preimage compression all - - Bagheri


Vincent Rijmen, Denis Toz, Kerem Varıcı - Pseudo-collision and pseudo-second preimage on JH

FSE ,2008
http://ehash.iaik.tugraz.at/uploads/a/a8/Jh1.txt
Bibtex
Author : Vincent Rijmen, Denis Toz, Kerem Varıcı
Title : Pseudo-collision and pseudo-second preimage on JH
In : FSE -
Address :
Date : 2008

Florian Mendel, Søren S. Thomsen - An Observation on JH-512

,2008
http://ehash.iaik.tugraz.at/uploads/d/da/Jh_preimage.pdf
Bibtex
Author : Florian Mendel, Søren S. Thomsen
Title : An Observation on JH-512
In : -
Address :
Date : 2008

Hongjun Wu - The Complexity of Mendel and Thomsen's Preimage Attack on JH-512

,2009
http://ehash.iaik.tugraz.at/uploads/6/6f/Jh_mt_complexity.pdf
Bibtex
Author : Hongjun Wu
Title : The Complexity of Mendel and Thomsen's Preimage Attack on JH-512
In : -
Address :
Date : 2009
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