Theory of Cryptography: 4th Theory of Cryptography Conference, TCC 2007, Amsterdam, The Netherlands, February 21-24, 2007, Proceedings: Lecture Notes in Computer Science, cartea 4392

Encryption I.- Does Privacy Require True Randomness?.- Tackling Adaptive Corruptions in Multicast Encryption Protocols.- Universally Composable Security.- Long-Term Security and Universal Composability.- Universally Composable Security with Global Setup.- Arguments and Zero Knowledge.- Parallel Repetition of Computationally Sound Protocols Revisited.- Lower Bounds for Non-interactive Zero-Knowledge.- Perfect NIZK with Adaptive Soundness.- Notions of Security.- Security Against Covert Adversaries: Efficient Protocols for Realistic Adversaries.- On the Necessity of Rewinding in Secure Multiparty Computation.- On Expected Probabilistic Polynomial-Time Adversaries: A Suggestion for Restricted Definitions and Their Benefits.- Obfuscation.- On Best-Possible Obfuscation.- Obfuscation for Cryptographic Purposes.- Securely Obfuscating Re-encryption.- Secret Sharing and Multiparty Computation.- Weakly-Private Secret Sharing Schemes.- On Secret Sharing Schemes, Matroids and Polymatroids.- Secure Linear Algebra Using Linearly Recurrent Sequences.- Towards Optimal and Efficient Perfectly Secure Message Transmission.- Signatures and Watermarking.- Concurrently-Secure Blind Signatures Without Random Oracles or Setup Assumptions.- Designated Confirmer Signatures Revisited.- From Weak to Strong Watermarking.- Private Approximation and Black-Box Reductions.- Private Approximation of Clustering and Vertex Cover.- Robuster Combiners for Oblivious Transfer.- One-Way Permutations, Interactive Hashing and Statistically Hiding Commitments.- Towards a Separation of Semantic and CCA Security for Public Key Encryption.- Key Establishment.- Unifying Classical and Quantum Key Distillation.- Intrusion-Resilient Key Exchange in the Bounded Retrieval Model.- (Password) Authenticated Key Establishment:From 2-Party to Group.- Encryption II.- Multi-authority Attribute Based Encryption.- Conjunctive, Subset, and Range Queries on Encrypted Data.- How to Shuffle in Public.- Evaluating Branching Programs on Encrypted Data.