| Paper Abstract and Keywords |
| Presentation |
2005-07-22 14:40
Improved Collision Attack on MD4 with Probability Almost 1
Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta (UEC) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
In EUROCRYPT2005, a collision attack on MD4 was proposed by Wang et. al..
Wang et. al. claimed that collision messeages are found with probability $2^{-6}$ to $2^{-2}$,
and the complexity is less than $2^8$ MD4 hash operations.
However, there were tyops and oversights in the method of Wang et. al..
In this paper, \\
~~{\bf (1)} We will evaluate the exact success probability again, \\
~~{\bf (2)} We will point out the typos and oversights in Wang's method, and \\
~~{\bf (3)} We will a new messege modification in third round of MD4. \\
From (1), we proved that the method of Wang et. al. can find collision messages with success probability $2^{5.61}$.
From (2), we are able to find collision messages with the probability $2^{-2}$.
Also by combining the results of (2) and (3), our improved method is able to find collision messages with
the probability almost 1.
This complexity is less than 3 repetitions of MD4 hash operations.
We confirmed that the improved method is about 85 times as fast as the method of Wang et. al.. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
MD4 / collision attack / message modification / sufficient condition / / / / |
| Reference Info. |
IEICE Tech. Rep., vol. 105, no. 194, ISEC2005-58, pp. 109-116, July 2005. |
| Paper # |
ISEC2005-58 |
| Date of Issue |
2005-07-15 (ISEC) |
| ISSN |
Print edition: ISSN 0913-5685 |
| Download PDF |
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| Conference Information |
| Committee |
ISEC IPSJ-CSEC SITE |
| Conference Date |
2005-07-21 - 2005-07-22 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Iwate Prefectural University |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
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| Paper Information |
| Registration To |
ISEC |
| Conference Code |
2005-07-ISEC-IPSJ-CSEC-SITE |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Improved Collision Attack on MD4 with Probability Almost 1 |
| Sub Title (in English) |
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| Keyword(1) |
MD4 |
| Keyword(2) |
collision attack |
| Keyword(3) |
message modification |
| Keyword(4) |
sufficient condition |
| Keyword(5) |
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| 1st Author's Name |
Yusuke Naito |
| 1st Author's Affiliation |
The University of Electro-Communications (UEC) |
| 2nd Author's Name |
Yu Sasaki |
| 2nd Author's Affiliation |
The University of Electro-Communications (UEC) |
| 3rd Author's Name |
Noboru Kunihiro |
| 3rd Author's Affiliation |
The University of Electro-Communications (UEC) |
| 4th Author's Name |
Kazuo Ohta |
| 4th Author's Affiliation |
The University of Electro-Communications (UEC) |
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| Speaker |
Author-1 |
| Date Time |
2005-07-22 14:40:00 |
| Presentation Time |
25 minutes |
| Registration for |
ISEC |
| Paper # |
ISEC2005-58 |
| Volume (vol) |
vol.105 |
| Number (no) |
no.194 |
| Page |
pp.109-116 |
| #Pages |
8 |
| Date of Issue |
2005-07-15 (ISEC) |
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