Difference between revisions of "MD4"

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* max. message length: < 2<sup>64</sup> bits
 
* max. message length: < 2<sup>64</sup> bits
 
* compression function: 512-bit message block, 128-bit chaining variable
 
* compression function: 512-bit message block, 128-bit chaining variable
−
* Specification:
+
* Specification: [http://www.ietf.org/rfc/rfc1320.txt RFC1320]
 +
 
 
<bibtex>
 
<bibtex>
 
@inproceedings{cryptoRivest90,
 
@inproceedings{cryptoRivest90,
Line 232: Line 233:
  
 
=== Preimage Attacks ===
 
=== Preimage Attacks ===
 +
 +
<bibtex>
 +
@inproceedings{fseLeurent08,
 +
  author    = {Ga{\"e}tan Leurent},
 +
  title    = {MD4 is Not One-Way},
 +
  booktitle = {FSE},
 +
  year      = {2008},
 +
  pages    = {412-428},
 +
  abstract  = {MD4 is a hash function introduced by Rivest in 1990. It is still used in some contexts, and the most commonly used hash functions (MD5, SHA-1, SHA-2) are based on the design principles of MD4. MD4 has been extensively studied and very efficient collision attacks are known, but it is still believed to be a one-way function. In this paper we show a partial pseudo-preimage attack on the compression function of MD4, using some ideas from previous cryptanalysis of MD4. We can choose 64 bits of the output for the cost of 2^32 compression function computations (the remaining bits are randomly chosen by the preimage algorithm). This gives a preimage attack on the compression function of MD4 with complexity 2^96, and we extend it to an attack on the full MD4 with complexity 2^102. As far as we know this is the first preimage attack on a member of the MD4 family. },
 +
  url        = {http://dx.doi.org/10.1007/978-3-540-71039-4_26},
 +
  editor    = {Kaisa Nyberg},
 +
  publisher = {Springer},
 +
  series    = {LNCS},
 +
  volume    = {5086},
 +
  isbn      = {978-3-540-71038-7},
 +
}
 +
</bibtex>
  
 
<bibtex>
 
<bibtex>

Latest revision as of 11:32, 10 November 2008

1 Specification

  • digest size: 128 bits
  • max. message length: < 264 bits
  • compression function: 512-bit message block, 128-bit chaining variable
  • Specification: RFC1320

Ronald L. Rivest - The MD4 Message Digest Algorithm

CRYPTO 537:303-311,1990
http://link.springer.de/link/service/series/0558/bibs/0537/05370303.htm
Bibtex
Author : Ronald L. Rivest
Title : The MD4 Message Digest Algorithm
In : CRYPTO -
Address :
Date : 1990

2 Cryptanalysis

2.1 Best Known Results

2.2 Generic Attacks

2.3 Collision Attacks

Hongbo Yu, Xiaoyun Wang - Multi-collision Attack on the Compression Functions of MD4 and 3-Pass HAVAL

ICISC 4817:206-226,2007
http://dx.doi.org/10.1007/978-3-540-76788-6_17
Bibtex
Author : Hongbo Yu, Xiaoyun Wang
Title : Multi-collision Attack on the Compression Functions of MD4 and 3-Pass HAVAL
In : ICISC -
Address :
Date : 2007

Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro - New Message Difference for MD4

FSE 4593:329-348,2007
http://dx.doi.org/10.1007/978-3-540-74619-5_21
Bibtex
Author : Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro
Title : New Message Difference for MD4
In : FSE -
Address :
Date : 2007

Gaëtan Leurent - Message Freedom in MD4 and MD5 Collisions: Application to APOP

FSE 4593:309-328,2007
http://dx.doi.org/10.1007/978-3-540-74619-5_20
Bibtex
Author : Gaëtan Leurent
Title : Message Freedom in MD4 and MD5 Collisions: Application to APOP
In : FSE -
Address :
Date : 2007

Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta - Improved Collision Attack on MD4 with Probability Almost 1

ICISC 3935:129-145,2005
http://dx.doi.org/10.1007/11734727_12
Bibtex
Author : Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta
Title : Improved Collision Attack on MD4 with Probability Almost 1
In : ICISC -
Address :
Date : 2005

Xiaoyun Wang, Xuejia Lai, Dengguo Feng, Hui Chen, Xiuyuan Yu - Cryptanalysis of the Hash Functions MD4 and RIPEMD

EUROCRYPT 3494:1-18,2005
http://dx.doi.org/10.1007/11426639_1
Bibtex
Author : Xiaoyun Wang, Xuejia Lai, Dengguo Feng, Hui Chen, Xiuyuan Yu
Title : Cryptanalysis of the Hash Functions MD4 and RIPEMD
In : EUROCRYPT -
Address :
Date : 2005

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

Bert den Boer, Antoon Bosselaers - An Attack on the Last Two Rounds of MD4

CRYPTO 576:194-203,1991
http://link.springer.de/link/service/series/0558/bibs/0576/05760194.htm
Bibtex
Author : Bert den Boer, Antoon Bosselaers
Title : An Attack on the Last Two Rounds of MD4
In : CRYPTO -
Address :
Date : 1991

2.4 Second Preimage Attacks

2.5 Preimage Attacks

Ga\"etan Leurent - MD4 is Not One-Way

FSE 5086:412-428,2008
http://dx.doi.org/10.1007/978-3-540-71039-4_26
Bibtex
Author : Ga\"etan Leurent
Title : MD4 is Not One-Way
In : FSE -
Address :
Date : 2008

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

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.} }

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