Titlebook: Research in Cryptology; Second Western Europ Stefan Lucks,Ahmad-Reza Sadeghi,Christopher Wolf Conference proceedings 2008 Springer-Verlag B

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Specific S-Box Criteria in Algebraic Attacks on Block Ciphers with Several Known Plaintexts,erably lowers the maximum degree of polynomials that appear in the attack, which allows much faster attacks, some of which can actually be handled experimentally. We point out a theoretical reason why such attacks are more efficient, lying in certain types of multivariate equations that do exist for

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Combiner Driven Management Models and Their Applications,hanged. We will introduce a new phase in the lifetime of secret sharing schemes to simplify constructions of multi-time secret sharing schemes and propose management models that allow unlimited updates from arbitrary schemes without need for broadcasts. As an example, we give an implementation based

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New Attacks on the Stream Cipher TPy6 and Design of New Ciphers the TPy6-A and the TPy6-B,’ ciphers of the Phase II of the eSTREAM project. However, due to some cryptanalytic results, strengthened versions of the ciphers, namely, the TPy, the TPypy and the TPy6 were built. In this paper, we find hitherto unknown weaknesses in the keystream generation algorithms of the Py6 and its stronge

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