This book constitutes the thoroughly refereed post-conference proceedings of the 9th International Conference on Information Security and Cryptology Inscrypt 2013 held in Guangzhou China in November 2013. The 21 revised full papers presented together with 4 short papers were carefully reviewed and selected from 93 submissions. The papers cover the topics of Boolean function and block cipher sequence and stream cipher applications: systems and theory computational number theory public key cryptography has function side-channel and leakage and application and system security.