MD4

1 Specification

• digest size: 128 bits
• max. message length: < 2⁶⁴ bits
• compression function: 512-bit message block, 128-bit chaining variable
• Specification:

2 Cryptanalysis

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2.2 Generic Attacks

• Generic Attacks on the Merkle-Damgaard Construction

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2.3 Collision Attacks

Hans Dobbertin - Cryptanalysis of MD4

J. Cryptology 11(4):253-271,1998

http://link.springer.de/link/service/journals/00145/bibs/11n4p253.html
Bibtex

Author : Hans Dobbertin
Title : Cryptanalysis of MD4
In : J. Cryptology -
Address :
Date : 1998

Hans Dobbertin - Cryptanalysis of MD4

FSE 1039:53-69,1996

http://dx.doi.org/10.1007/s001459900047
Bibtex

Author : Hans Dobbertin
Title : Cryptanalysis of MD4
In : FSE -
Address :
Date : 1996

Serge Vaudenay - On the Need for Multipermutations: Cryptanalysis of MD4 and SAFER

FSE 1008:286-297,1995

http://dx.doi.org/10.1007/3-540-60590-8_22
Bibtex

Author : Serge Vaudenay
Title : On the Need for Multipermutations: Cryptanalysis of MD4 and SAFER
In : FSE -
Address :
Date : 1995

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2.5 Preimage Attacks

Hans Dobbertin - The First Two Rounds of MD4 are Not One-Way

FSE 1372:284-292,1998

http://dx.doi.org/10.1007/3-540-69710-1_19
Bibtex

Author : Hans Dobbertin
Title : The First Two Rounds of MD4 are Not One-Way
In : FSE -
Address :
Date : 1998

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2.6 Others

<bibtex> @inproceedings{fseSchlafferO06,

 author    = {Martin Schläffer and Elisabeth Oswald},
 title     = {Searching for Differential Paths in MD4},
 pages     = {242-261},
 url        = {http://dx.doi.org/10.1007/11799313_16},
 booktitle = {FSE},
 publisher = {Springer},
 series    = {LNCS},
 volume    = {4047},
 year      = {2006},
 isbn      = {3-540-36597-4},
 abstract  = {The ground-breaking results of Wang et al. 

have attracted a lot of attention to the collision resistance of hash functions. In their articles, Wang et al. give input differences, differential paths and the corresponding conditions that allow to find collisions with a high probability. However, Wang et al. do not explain how these paths were found. The common assumption is that they were found by hand with a great deal of intuition. In this article, we present an algorithm that allows to find paths in an automated way. Our algorithm is successful for MD4. We have found over 1000 differential paths so far. Amongst them, there are paths that have fewer conditions in the second round than the path of Wang et al. for MD4. This makes them better suited for the message modification techniques that were also introduced by Wang et al.} }