This book constitutes the refereed proceedings of the first International Theory of Cryptography Conference, TCC 2004, held in Cambridge, MA, USA in February 2004.The 28 revised full papers presented were carefully reviewed and selected from 70 submissions. The papers constitute a unique account of original research results on theoretical and foundational topics in cryptography; they deal with the paradigms, approaches, and techniques used to conceptualize, define, and provide solutions to natural cryptographic problems.

This book constitutes the refereed proceedings of the 26th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2007, held in Barcelona, Spain in May 2007. The 33 revised full papers address all current foundational, theoretical and research aspects of cryptology, cryptography, and cryptanalysis as well as advanced applications.