Description:The 27th Annual International Cryptology Conference was held in Santa Barbara, California, in August 2007. The conference drew researchers from around the world who came to present their findings and discuss the latest developments in the field. This book constitutes the refereed proceedings of the conference.Thirty-three full papers are presented along with one important invited lecture. Each one has been carefully reviewed by the editor to ensure that all papers are accurate, easy to read, and make an important contribution to the field.The papers address current foundational, theoretical, and research aspects of cryptology, cryptography, and cryptanalysis. In addition, readers will discover many advanced and emerging applications.