| Presentation | 2007-11-22 A Key Recovery Attack on WEP with Less Packets Toshihiro OHIGASHI, Hidenori KUWAKADO, Masakatu MORII, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | E. Tews, R. Weinmann, and A. Pyshkin have recently shown a key recovery attack on WEP (called the PTW attack). The PTW attack recovers a 104-bit secret key from the first 15 bytes of a keystream, which is obtained from the output of WEP. It recovers the secret key with a probability of 0.5 when 40,000 packets are given, or with a probability of 0.95 when 85,000 packets are given. Their attack is one of the most effective attack on WEP. This paper proposes a key recovery attack, which uses the first 30 bytes of the keystream. In order to use the 16-30th bytes of the keystream for the attack, we give two processes. Our attack halves the number of packets for similar probability that the 104-bit secret key is recovered by the PTW attack. In particular, our attack can recover the secret key with a non-negligible probability when the number of packets is small, for example, 5,000, 7,500, or 10,000. Therefore, even low-traffic communication on WEP allows an attacker to recover a secret key. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | cryptanalysis / key recovery attack / stream cipher / RC4 / WEP |
| Paper # | ISEC2007-109,OIS2007-81 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2007/11/15(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Information Security (ISEC) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Key Recovery Attack on WEP with Less Packets |
| Sub Title (in English) | |
| Keyword(1) | cryptanalysis |
| Keyword(2) | key recovery attack |
| Keyword(3) | stream cipher |
| Keyword(4) | RC4 |
| Keyword(5) | WEP |
| 1st Author's Name | Toshihiro OHIGASHI |
| 1st Author's Affiliation | Graduate School of Science and Technology, Kobe University() |
| 2nd Author's Name | Hidenori KUWAKADO |
| 2nd Author's Affiliation | Graduate School of Engineering, Kobe University |
| 3rd Author's Name | Masakatu MORII |
| 3rd Author's Affiliation | Graduate School of Engineering, Kobe University |
| Date | 2007-11-22 |
| Paper # | ISEC2007-109,OIS2007-81 |
| Volume (vol) | vol.107 |
| Number (no) | 346 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |