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.

This book constitutes the refereed proceedings of the Second Western European Workshop on Research in Cryptology, WEWoRC 2007, held in Bochum, Germany, in July 2007 The 12 revised full papers were carefully reviewed and selected from a total of 36 submissions. The papers cover topics such as foundations of cryptology, secret-key cryptosystems and hash functions, public-key cryptosystems, cryptographic protocols, implementation of cryptosystems and their integration into secure systems, secure operating systems and trusted computing, applications such as watermarking and code obfuscation.