Advances in Information and Computer Security

This book constitutes the refereed proceedings of the 18th International Workshop on Security, IWSEC 2023, which took place as a hybrid event in Yokohama, Japan, during August 29-31, 2023. This event was held in hybrid mode. The 14 full papers presented in this book were carefully reviewed andselected from 47 submissions. They were organized in topical sections asfollows: System and Hardware Security; Symmetric Key Cryptography;Public Key Cryptography; Zero Knowledge Proofs; and Card BasedCryptography.