Another year, another workshop. Here are the proceedings of the seventh Cambridge International Workshop on Security Protocols. All very well, you may think, but can there really still be anything genuinely new to say? Is it not just the same old things a tiny bit better? Well, perhaps surprisingly, this year we discoveredsome radically new things beginning to happen. The reasons in retrospect are not far to seek: advances in technology, changes in the system context, and new types of consumer devices and applications have combined to expose new security requirements. This has led not only to...

This book constitutes the thoroughly refereed post-proceedings of the 17th International Workshop on Security Protocols, SP 2009, held in Cambridge, UK, in April 2009. The 17 revised full papers presented together with edited transcriptions of some of the discussions following the presentations have gone through multiple rounds of reviewing, revision, and selection. The theme of this workshop was Brief Encounters. In the old days, security protocols were typically run first as preliminaries to, and later to maintain, relatively stable continuing relationships between relatively unchanging...