This book constitutes the refereed proceedings of the 11th International Workshop on Security
IWSEC 2016 held in Tokyo Japan in September 2016. The 15 regular papers and 4 short papers
presented in this volume were carefully reviewed and selected from 53 submissions. They were
organized in topical sections named: system security searchable encryption cryptanalysis
permutation and symmetric encryption privacy preserving hardware security post-quantum
cryptography and paring computation.