Software and Multimedia Security -- A Note on the (Im)possibility of Using Obfuscators to Transform Private-Key Encryption into Public-Key Encryption -- Design Issues of an Isolated Sandbox Used to Analyze Malwares -- Collusion-Resistant Fingerprinting Scheme Based on the CDMA-Technique -- Public-Key Cryptography (1) -- Reduction Optimal Trinomials for Efficient Software Implementation of the ? T Pairing -- Experiments on the Linear Algebra Step in the Number Field Sieve -- Batch Pairing Delegation -- Botnet Traffic Detection Techniques by C&C Session Classification Using SVM -- A Global Authentication Scheme for Mobile Ad-Hoc Networks -- An Efficient Pre-authentication Scheme for IEEE 802.11-Based Vehicular Networks -- Intrusion Detection and Identification System Using Data Mining and Forensic Techniques -- Run-Time Randomization to Mitigate Tampering -- Privacy-Preserving Eigentaste-Based Collaborative Filtering -- Secure and Private Incentive-Based Advertisement Dissemination in Mobile Ad Hoc Networks -- Verifiable Internet Voting Solving Secure Platform Problem -- Enforcement of Integrated Security Policy in Trusted Operating Systems -- Salvia: A Privacy-Aware Operating System for Prevention of Data Leakage -- InfoCage: A Development and Evaluation of Confidential File Lifetime Monitoring Technology by Analyzing Events from File Systems and GUIs -- Public-Key Cryptography (2) -- Accredited Symmetrically Private Information Retrieval -- Generic Certificateless Encryption in the Standard Model -- On Security Models and Compilers for Group Key Exchange Protocols -- Processing Multi-parameter Attacktrees with Estimated Parameter Values -- Practical Security Analysis of E-Voting Systems -- Fine-Grained Sticky Provenance Architecture for Office Documents -- Secure Anonymous Communications with Practical Anonymity Revocation Scheme -- GAS: Overloading a File Sharing Network as an Anonymizing System -- A Composite Privacy Protection Model -- Nominative Signature from Ring Signature -- Anonymous Authentication Protocols with Credit-Based Chargeability and Fair Privacy for Mobile Communications -- How to Find Many Collisions of 3-Pass HAVAL -- A Secure Threshold Anonymous Password-Authenticated Key Exchange Protocol.

This book constitutes the refereed proceedings of the Second International Workshop on Security, IWSEC 2007, held in Nara, Japan, October 29-31, 2007. The 30 revised full papers presented were carefully reviewed and selected from 112 submissions. The papers are organized in topical sections on Software and Multimedia security, Public-key cryptography, Network security, E-commerce and Voting, Operating systems, Security and Information management, Anonymity and Privacy and Digital signatures, Hash function and Protocol.