This book constitutes the refereed proceedings of the 5th International Conference on Applied Cryptography and Network Security, ACNS 2007, held in Zhuhai, China, June 2007. The 31 revised full papers cover signature schemes, computer and network security, cryptanalysis, group-oriented security, cryptographic protocols, anonymous authentication, identity-based cryptography, and security in wireless, ad-hoc, and peer-to-peer networks.

Signature Schemes I.- Generic Transformation to Strongly Unforgeable Signatures.- Efficient Generic On-Line/Off-Line Signatures Without Key Exposure.- Merkle Signatures with Virtually Unlimited Signature Capacity.- Computer and Network Security.- Midpoints Versus Endpoints: From Protocols to Firewalls.- An Adversary Aware and Intrusion Detection Aware Attack Model Ranking Scheme.- Analyzing an Electronic Cash Protocol Using Applied Pi Calculus.- Cryptanalysis.- Cryptanalysis of the TRMC-4 Public Key Cryptosystem.- Estimating the Prime-Factors of an RSA Modulus and an Extension of the Wiener Attack.- A Timing Attack on Blakley's Modular Multiplication Algorithm, and Applications to DSA.- Protecting AES Software Implementations on 32-Bit Processors Against Power Analysis.- Group-Oriented Security.- Constant-Round Authenticated Group Key Exchange with Logarithmic Computation Complexity.- Preventing Collusion Attacks on the One-Way Function Tree (OFT) Scheme.- Bayesian Methods for Practical Traitor Tracing.- Cryptographic Protocols.- A New Protocol for Conditional Disclosure of Secrets and Its Applications.- An Unconditionally Secure Protocol for Multi-Party Set Intersection.- Privacy-Preserving Set Union.- Anonymous Authentication.- Universal Accumulators with Efficient Nonmembership Proofs.- Unlinkable Secret Handshakes and Key-Private Group Key Management Schemes.- Identity-Based Cryptography.- Identity-Based Proxy Re-encryption.- A More Natural Way to Construct Identity-Based Identification Schemes.- Tweaking TBE/IBE to PKE Transforms with Chameleon Hash Functions.- Certified E-Mail Protocol in the ID-Based Setting.- Security in Wireless, Ad-Hoc, and Peer-to-Peer Networks.- Efficient Content Authentication in Peer-to-Peer Networks.- An Identity-Based Signcryption Scheme for Multi-domain Ad Hoc Networks.- Efficient Self-healing Key Distribution with Revocation for Wireless Sensor Networks Using One Way Key Chains.- BAP: Broadcast Authentication Using Cryptographic Puzzles.- Efficient Implementation.- Compressed XTR.- Sliding Window Method for NTRU.- Signature Schemes II.- Efficient Certificateless Signature Schemes.- Security Mediated Certificateless Signatures.- Gradually Convertible Undeniable Signatures.