| Presentation | 2004-07-21 Evaluation of Guess-and-Determine Attacks on Clock Controlled Stream Ciphers Shinsaku KIYOMOTO, Toshiaki TANAKA, Kouichi SAKURAI, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Guess-and-Determine attacks have recently been proposed for the effective analysis of word-oriented stream ciphers. In this paper, we discuss GD attacks on stream ciphers using a clock controller as a non-linear function. We focus on analyzing the influence of the clock controller. First, we model a stream ciphers and discuss a maximum process complexity of GD attacks for existing stream ciphers. Next, we propose GD attacks on typical clock controlled stream ciphers, which uses a clock controller. We remove the irregularity of clocking to use a as-sumption. In the attacks, we assume some condition, for example, clocking of LFSRs is truly random. An important condition for practical attacks, is the real probabilities of assumptions because the clocking is determined by current internal states. We also implement toy ciphers of clock controlled stream ciphers to evaluate the proposed attacks, and evaluate feasibility of the attacks. We also discuss properties of GD attacks on clock controlled stream ciphers and the effectiveness of the clock controllers. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Stream Cipher / Guess-and-Determine Attack / AA5 |
| Paper # | ISEC2004-49 |
| Date of Issue |
| Conference Information | |
| Committee | ISEC |
|---|---|
| Conference Date | 2004/7/14(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Information Security (ISEC) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Evaluation of Guess-and-Determine Attacks on Clock Controlled Stream Ciphers |
| Sub Title (in English) | |
| Keyword(1) | Stream Cipher |
| Keyword(2) | Guess-and-Determine Attack |
| Keyword(3) | AA5 |
| 1st Author's Name | Shinsaku KIYOMOTO |
| 1st Author's Affiliation | KDDI R & D Laboratories Inc.() |
| 2nd Author's Name | Toshiaki TANAKA |
| 2nd Author's Affiliation | KDDI R & D Laboratories Inc. |
| 3rd Author's Name | Kouichi SAKURAI |
| 3rd Author's Affiliation | Dept. of CSCE., Kyushu University |
| Date | 2004-07-21 |
| Paper # | ISEC2004-49 |
| Volume (vol) | vol.104 |
| Number (no) | 200 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |