Research in Cryptology

A Privacy Protection Scheme for a Scalable Control Method in Context-Dependent Services.- The GPS Identification Scheme Using Frobenius Expansions.- Searching for Messages Conforming to Arbitrary Sets of Conditions in SHA-256.- Efficient Hash Collision Search Strategies on Special-Purpose Hardware.- Cryptography Based on Quadratic Forms: Complexity Considerations.- Towards a Concrete Security Proof of Courtois, Finiasz and Sendrier Signature Scheme.- Cryptanalysis of MOR and Discrete Logarithms in Inner Automorphism Groups.- Preimages for Reduced-Round Tiger.- Specific S-Box Criteria in Algebraic Attacks on Block Ciphers with Several Known Plaintexts.- Combiner Driven Management Models and Their Applications.- New Attacks on the Stream Cipher TPy6 and Design of New Ciphers the TPy6-A and the TPy6-B.- Cryptanalysis of Achterbahn-128/80 with a New Keystream Limitation.