This book constitutes the refereed proceedings of the 17th International Workshop on Security, IWSEC 2022, which took place as a hybrid event in Tokyo, Japan, in August/September 2022.  The 12 full papers presented in this book were carefully reviewed and selected from 34 submissions. They were organized in topical sections as follows: mathematical cryptography; system security and threat intelligence; symmetric-key cryptography; post-quantum cryptography; advanced cryptography.