This year IWSEC 2010 had three tracks, the Foundations of Security (Track I), Security in Networks and Ubiquitous Computing Systems (Track II), and Security in Real Life Applications (Track III), and the review and selection processes for these tracks were independent of each other.
This book constitutes the refereed proceedings of the 5th International Workshop on Security, IWSEC 2010, held in Kobe, Japan, in November 2010. The 22 revised full papers presented together with 2 invited talk were carefully reviewed and selected from 75 submissions. The papers are organized in topical sections on encryption, data and web security, protocols, network security, block cipher, and implementation and real life security.