TMTO attacks on stream ciphers – theory and practice
| Autoři | |
|---|---|
| Rok publikování | 2011 |
| Druh | Článek ve sborníku |
| Konference | Security and Protection of Information 2011 |
| Fakulta / Pracoviště MU | |
| Citace | |
| Obor | Informatika |
| Klíčová slova | Hellman tables; Rainbow tables; stream ciphers; timememory tradeoff |
| Popis | This paper deals with issues related to a cryptanalytic time-memory trade-off (TMTO) attacks on stream ciphers. We describe the basic theory and principles of TMTO attacks and their practical application on selected stream ciphers – namely on A5/1 cipher that is used in GSM (Global System for Mobile communications) standard. We focus mainly on the pre-computation phase of TMTO attacks. This phase includes data pre-computation and construction of various types of Hellman or Rainbow tables. The goal of the pre-computation is to cover some percentage of the key space with specially constructed chains. Our results demonstrate the real impact of various table parameters and chain constructions and show a substantial difference between theory and practice. |
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