JH

1 The algorithm

• Author(s): Hongjun Wu
• Website: http://icsd.i2r.a-star.edu.sg/staff/hongjun/jh/
• NIST submission package:
  • round 1/2: JH_Round2.zip (old versions: JH.zip, JHUpdate.zip)

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
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