Difference between revisions of "JH"

From The ECRYPT Hash Function Website
m (updated link to round 2 submission)
(separate cryptanalysis tables)
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== Cryptanalysis ==
 
== Cryptanalysis ==
 +
 +
We distinguish between two cases: results on the complete hash function, and results on underlying building blocks.
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 +
A description of the tables is given [http://ehash.iaik.tugraz.at/wiki/Cryptanalysis_Categories#Individual_Hash_Function_Tables here].
 +
 +
 +
=== Hash function ===
 +
 +
Here we list results on the actual hash function. The only allowed modification is to change the security parameter.
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 +
Recommended security parameter: '''35.5''' rounds
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 +
{| border="1" cellpadding="4" cellspacing="0" class="wikitable" style="text-align:center"                 
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|- style="background:#efefef;"                 
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|  Type of Analysis || Hash Size (n) || Parameters/Variants || Compression Function Calls || Memory Requirements ||  Reference
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|-                                   
 +
|  style="background:greenyellow" | preimage<sup>(1)</sup> || 512 ||  || 2<sup>510.3</sup> (+ 2<sup>524</sup> MA + 2<sup>524</sup> CMP) || 2<sup>510.3</sup> (Wu: 2<sup>510.6</sup>) || [http://ehash.iaik.tugraz.at/uploads/d/da/Jh_preimage.pdf Mendel,Thomsen], [http://ehash.iaik.tugraz.at/uploads/6/6f/Jh_mt_complexity.pdf Wu]
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|-                                     
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|}                   
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<sup>(1)</sup> Wu has analyzed the exact memory requirements, additional memory accesses (MA) and comparisons (CMP) of the attack by Mendel and Thomsen.
 +
 +
 +
=== 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).
  
 
{| border="1" cellpadding="4" cellspacing="0" class="wikitable" style="text-align:center"                   
 
{| border="1" cellpadding="4" cellspacing="0" class="wikitable" style="text-align:center"                   
Line 38: Line 66:
 
|  | 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]
 
|-                     
 
|-                     
|  style="background:greenyellow" | preimage<sup>(1)</sup> || hash || 512 ||  || 2<sup>510.3</sup> (+ 2<sup>524</sup> MA + 2<sup>524</sup> CMP) || 2<sup>510.3</sup> (Wu: 2<sup>510.6</sup>) || [http://ehash.iaik.tugraz.at/uploads/d/da/Jh_preimage.pdf Mendel,Thomsen], [http://ehash.iaik.tugraz.at/uploads/6/6f/Jh_mt_complexity.pdf Wu]
 
|-                                     
 
 
|}                     
 
|}                     
  
A description of this table is given [http://ehash.iaik.tugraz.at/wiki/Cryptanalysis_Categories#Individual_Hash_Function_Tables here].
 
  
<sup>(1)</sup> Wu has analyzed the exact memory requirements, additional memory accesses (MA) and comparisons (CMP) of the attack by Mendel and Thomsen.
 
  
  

Revision as of 21:45, 29 January 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 actual hash function. The only allowed modification is to change the security parameter.

Recommended security parameter: 35.5 rounds

Type of Analysis Hash Size (n) Parameters/Variants 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
pseudo-collision compression all - - Bagheri
pseudo-2nd preimage compression all - - Bagheri



Nasour Bagheri - Pseudo-collision and pseudo-second preimage on JH

,2008
http://ehash.iaik.tugraz.at/uploads/a/a8/Jh1.txt
Bibtex
Author : Nasour Bagheri
Title : Pseudo-collision and pseudo-second preimage on JH
In : -
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