This book constitutes the thoroughly refereed post-conference proceedings of the 11th International Conference on Information Security and Cryptology, Inscrypt 2015, held in Beijing, China in November 2015.The 27 revised full papers presented were carefully reviewed and selected from 79 submissions. The papers are organized in topical sections on hash function; signature schemes; symmetric ciphers; elliptic curve and cryptographic fundamentals; Web and applications security; cloud security; key management and public key encryption; zero knowledge and secure computations; software and mobile security.