Constitutes the refereed proceedings of the 12th Australasian Conference on Information Security and Privacy that was held in Townsville, Australia in July 2007. This book includes topical sections on stream ciphers, hashing, biometrics, secret sharing, cryptanalysis, public key cryptography, authentication, e-commerce, and security.

Stream Ciphers.- An Analysis of the Hermes8 Stream Ciphers.- On the Security of the LILI Family of Stream Ciphers Against Algebraic Attacks.- Strengthening NLS Against Crossword Puzzle Attack.- Hashing.- A New Strategy for Finding a Differential Path of SHA-1.- Preimage Attack on the Parallel FFT-Hashing Function.- Second Preimages for Iterated Hash Functions and Their Implications on MACs.- On Building Hash Functions from Multivariate Quadratic Equations.- Biometrics.- An Application of the Goldwasser-Micali Cryptosystem to Biometric Authentication.- Soft Generation of Secure Biometric Keys.- Secret Sharing.- Flaws in Some Secret Sharing Schemes Against Cheating.- Efficient (k,n) Threshold Secret Sharing Schemes Secure Against Cheating from n???1 Cheaters.- Cryptanalysis.- Related-Key Amplified Boomerang Attacks on the Full-Round Eagle-64 and Eagle-128.- Analysis of the SMS4 Block Cipher.- Forgery Attack to an Asymptotically Optimal Traitor Tracing Scheme.- Public Key Cryptography.- : A Hardware-Oriented Trapdoor Cipher.- Anonymity on Paillier’s Trap-Door Permutation.- Generic Certificateless Key Encapsulation Mechanism.- Double-Size Bipartite Modular Multiplication.- Affine Precomputation with Sole Inversion in Elliptic Curve Cryptography.- Construction of Threshold (Hybrid) Encryption in the Random Oracle Model: How to Construct Secure Threshold Tag-KEM from Weakly Secure Threshold KEM.- Efficient Chosen-Ciphertext Secure Identity-Based Encryption with Wildcards.- Authentication.- Combining Prediction Hashing and MDS Codes for Efficient Multicast Stream Authentication.- Certificateless Signature Revisited.- Identity-Committable Signatures and Their Extension to Group-Oriented Ring Signatures.- Hash-and-Sign with Weak Hashing Made Secure.- “Sandwich”Is Indeed Secure: How to Authenticate a Message with Just One Hashing.- Threshold Anonymous Group Identification and Zero-Knowledge Proof.- Non-interactive Manual Channel Message Authentication Based on eTCR Hash Functions.- E-Commerce.- A Practical System for Globally Revoking the Unlinkable Pseudonyms of Unknown Users.- Efficient and Secure Comparison for On-Line Auctions.- Practical Compact E-Cash.- Security.- Use of Dempster-Shafer Theory and Bayesian Inferencing for Fraud Detection in Mobile Communication Networks.- On Proactive Perfectly Secure Message Transmission.