This book constitutes the refereed proceedings of the International Biometric Authentication Workshop, BioAW 2004, held in Prague, Czech Republic, in May 2004, as part of ECCV 2004. The 30 revised full papers presented were carefully reviewed and selected for presentation. The papers are organized in topical sections on face recognition, fingerprint recognition, template protection and security, other biometrics, and fusion and multimodal bioinformatics.