This book constitutes the thoroughly refereed post-conference proceedings of the 11th International Workshop on Radio Frequency Identification held in New York, USA, in June 2015. The 10 revised full papers were carefully reviewed and selected from 23 submissions and are organized in topical sections on PUFs and applications, side-channels and countermeasures, RFID system attacks, and efficient implementations.

This book constitutes the refereed proceedings of the 4th International Conference on Security, Privacy, and Applied Cryptography Engineering held in Pune, India, in October 2014. The 19 papers presented together with two invited papers were carefully reviewed and selected from 66 submissions. The papers are organized in topical sections on cryptographic building blocks; mini tutorial; attacks and countermeasures; tools and methods; and secure systems and applications.