This book constitutes the proceedings of the 23rd International Conference on Information Security, ISC 2020, held in Bali, Indonesia, in December 2020. The 23 full papers presented in this volume were carefully reviewed and selected from 87 submissions. The papers cover topics of research in theory and applications of information security, such as Security and privacy and Network security as well.

This book constitutes the refereed proceedings of the 11th International Conference on Provable Security, ProvSec 2017, held in Xi'an, China, in October 2017. The 24 full papers and 5 short papers presented were carefully reviewed and selected from 76 submissions. The papers are grouped in topical sections on secure cloud storage and computing; digital signature and authentication; authenticated encryption and key exchange; security models; lattice and post-quantum cryptography; public key encryption and signcryption; proxy re-encryption and functional encryption; protocols.