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Deterministic Cryptanalysis of some Stream Ciphers

AutorCaballero-Gil, P.; Fúster-Sabater, A.; Hernández-Goya, C.
Palabras clavecryptanalysis
stream cipher
discrete mathematics
Fecha de publicaciónmay-2009
EditorInstitute for Systems and Technologies of Information, Control and Communication
CitaciónProceedings of the 7th International Workshop on Security Information Systems, WOSIS 2009, in conjunction with ICEIS 2009
Seriepp. 16-25
ResumenA new graph-based approach to edit distance cryptanalysis of some clock-controlled generators is here presented in order to simplify search trees of the original attacks. In particular, the proposed improve- ment is based on cut sets de¯ned on some graphs so that only the most promising branches of the search tree have to be analyzed because cer- tain shortest paths provide the edit distances. The strongest aspects of the proposal are: a) the obtained results from the attack are absolutely deterministic and b) many inconsistent initial states are recognized be- forehand and avoided during search.
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