This book constitutes the proceedings of the 11th International Conference on Information Security Practice and Experience, ISPEC 2015, held in Beijing China, in May 2015. The 38 papers presented in this volume were carefully reviewed and selected from 117 submissions. The regular papers are organized in topical sections named: system security, stream cipher, analysis, key exchange protocol, elliptic curve cryptography, authentication, attribute-based encryption, mobile security, theory, implementation, privacy and indistinguishability.

This book constitutes the post-conference proceedings of the 16th International Conference on Information Security and Cryptology, Inscrypt 2020, held in, China, in December 2020.Due the COVID-19, the conference was held online and physical. The 24 full papers presented together with 8 short papers were carefully reviewed and selected from 79 submissions. The papers presents papers about research advances in all areas of information security, cryptology, and their applications.