This book constitutes the refereed proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security, ASIACRYPT 2001, held in Gold Coast, Australia in December 2001. The 33 revised full papers presented together with an invited paper were carefully reviewed and selected from 153 submissions. The papers are organized in topical sections on lattice based cryptography, human identification, practical public key cryptography, cryptography based on coding theory, block ciphers, provable security, threshold cryptography, two-party protocols, zero knowledge, cryptographic building blocks, elliptic curve cryptography, and anonymity.