Difference between revisions of "DCH"
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* Author(s): David A. Wilson | * Author(s): David A. Wilson | ||
* Website: [http://web.mit.edu/dwilson/www/hash/ http://web.mit.edu/dwilson/www/hash/] | * Website: [http://web.mit.edu/dwilson/www/hash/ http://web.mit.edu/dwilson/www/hash/] | ||
| − | * | + | * NIST submission package: [http://csrc.nist.gov/groups/ST/hash/sha-3/Round1/documents/DCH.zip DCH.zip] |
| + | |||
<bibtex> | <bibtex> | ||
| − | @misc{ | + | @misc{sha3Wilson08, |
author = {David A. Wilson}, | author = {David A. Wilson}, | ||
title = {The DCH Hash Function}, | title = {The DCH Hash Function}, | ||
| Line 14: | Line 15: | ||
} | } | ||
</bibtex> | </bibtex> | ||
| + | |||
== Cryptanalysis == | == Cryptanalysis == | ||
| − | + | {| border="1" cellpadding="4" cellspacing="0" class="wikitable" style="text-align:center" | |
| + | |- style="background:#efefef;" | ||
| + | | Type of Analysis || Hash Function Part || Hash Size (n) || Parameters/Variants || Compression Function Calls || Memory Requirements || Reference | ||
| + | |- | ||
| + | | style="background:red" | collision || hash || all || || 521 || - || [http://ehash.iaik.tugraz.at/uploads/9/9b/Dch.pdf Mendel,Lamberger] | ||
| + | |- | ||
| + | | style="background:red" | preimage || hash || all || || 521 || - || [http://ehash.iaik.tugraz.at/uploads/9/9b/Dch.pdf Mendel,Lamberger] | ||
| + | |- | ||
| + | | style="background:orange" | collision || hash || all || || 2<sup>45</sup> || 2<sup>45</sup> || [http://ehash.iaik.tugraz.at/uploads/b/b7/Dch1.pdf Khovratovich,Nikolić] | ||
| + | |- | ||
| + | | style="background:orange" | preimage || hash || all || || 2<sup>45</sup> || 2<sup>45</sup> || [http://ehash.iaik.tugraz.at/uploads/b/b7/Dch1.pdf Khovratovich,Nikolić] | ||
| + | |- | ||
| + | | style="background:yellow" | 2nd preimage || hash || 512 || || 2<sup>450</sup> || ? || [http://web.mit.edu/dwilson/www/hash/ Rechberger] | ||
| + | |- | ||
| + | |} | ||
| + | |||
| + | A description of this table is given [http://ehash.iaik.tugraz.at/wiki/Cryptanalysis_Categories#Individual_Hash_Function_Tables here]. | ||
| + | |||
| + | |||
| + | <bibtex> | ||
| + | @misc{dchLM08, | ||
| + | author = {Mario Lamberger and Florian Mendel}, | ||
| + | title = {Practical Collision and Preimage Attack on DCH-n}, | ||
| + | url = {http://ehash.iaik.tugraz.at/uploads/9/9b/Dch.pdf}, | ||
| + | howpublished = {Available online}, | ||
| + | abstract = {In this paper, we show practical collision and preimage attacks on DCH-n. The attacks are based on the observation of Khovratovich and Nikolic that the chaining value is not used in the underlying block cipher. Based on this observation, we show a trivial collision resp. multi-collision attack on DCH-n and a preimage attack with a complexity of about 521 compression function evaluations.}, | ||
| + | year = {2008}, | ||
| + | } | ||
| + | </bibtex> | ||
| + | |||
| + | <bibtex> | ||
| + | @misc{dchKN08, | ||
| + | author = {Dmitry Khovratovich and Ivica Nikolić}, | ||
| + | title = {Cryptanalysis of DCH-n}, | ||
| + | url = {http://ehash.iaik.tugraz.at/uploads/b/b7/Dch1.pdf}, | ||
| + | howpublished = {Available online}, | ||
| + | abstract = {We present collision and preimage attacks on DCH-n. The attacks exploit a design weakness of the underlying compression function. Both attacks require 2^45 computations and memory.}, | ||
| + | year = {2008}, | ||
| + | } | ||
| + | </bibtex> | ||
| + | |||
| + | <bibtex> | ||
| + | @misc{dchR08, | ||
| + | author = {Christian Rechberger}, | ||
| + | title = {Personal communication (second preimage attack)}, | ||
| + | url = {http://web.mit.edu/dwilson/www/hash/}, | ||
| + | howpublished = {Reported online}, | ||
| + | year = {2008}, | ||
| + | } | ||
| + | </bibtex> | ||
Latest revision as of 22:04, 29 December 2008
1 The algorithm
- Author(s): David A. Wilson
- Website: http://web.mit.edu/dwilson/www/hash/
- NIST submission package: DCH.zip
David A. Wilson - The DCH Hash Function
- ,2008
- http://web.mit.edu/dwilson/www/hash/dch/Supporting_Documentation/dch.pdf
BibtexAuthor : David A. Wilson
Title : The DCH Hash Function
In : -
Address :
Date : 2008
2 Cryptanalysis
| Type of Analysis | Hash Function Part | Hash Size (n) | Parameters/Variants | Compression Function Calls | Memory Requirements | Reference |
| collision | hash | all | 521 | - | Mendel,Lamberger | |
| preimage | hash | all | 521 | - | Mendel,Lamberger | |
| collision | hash | all | 245 | 245 | Khovratovich,Nikolić | |
| preimage | hash | all | 245 | 245 | Khovratovich,Nikolić | |
| 2nd preimage | hash | 512 | 2450 | ? | Rechberger |
A description of this table is given here.
Mario Lamberger, Florian Mendel - Practical Collision and Preimage Attack on DCH-n
- ,2008
- http://ehash.iaik.tugraz.at/uploads/9/9b/Dch.pdf
BibtexAuthor : Mario Lamberger, Florian Mendel
Title : Practical Collision and Preimage Attack on DCH-n
In : -
Address :
Date : 2008
Dmitry Khovratovich, Ivica Nikolić - Cryptanalysis of DCH-n
- ,2008
- http://ehash.iaik.tugraz.at/uploads/b/b7/Dch1.pdf
BibtexAuthor : Dmitry Khovratovich, Ivica Nikolić
Title : Cryptanalysis of DCH-n
In : -
Address :
Date : 2008
Christian Rechberger - Personal communication (second preimage attack)
