Trustworthy Paper Documents -- An Implementation of Key-Based Digital Signal Steganography -- Distortion-Free Data Embedding for Images -- Information Hiding through Noisy Channels -- A Perceptual Audio Hashing Algorithm: A Tool for Robust Audio Identification and Information Hiding -- Computational Forensic Techniques for Intellectual Property Protection -- Intellectual Property Metering -- Keyless Public Watermarking for Intellectual Property Authentication -- Efficiency Improvements of the Private Message Service -- A Reputation System to Increase MIX-Net Reliability -- Neural Networks Functions for Public Key Watermarking -- A Graph Theoretic Approach to Software Watermarking -- COiN-Video: A Model for the Dissemination of Copyrighted Video Streams over Open Networks -- Natural Language Watermarking: Design, Analysis, and a Proof-of-Concept Implementation -- Digital Watermarking of Chemical Structure Sets -- The Strong Eternity Service -- Real World Patterns of Failure in Anonymity Systems -- Traffic Analysis Attacks and Trade-Offs in Anonymity Providing Systems -- Automatic Detection of a Watermarked Document Using a Private Key -- Zero-Knowledge Watermark Detection and Proof of Ownership -- F5—A Steganographic Algorithm -- A Collusion-Secure Fingerprinting Code Reduced by Chinese Remaindering and Its Random-Error Resilience -- Practical Capacity of Digital Watermarks -- Blur/Deblur Attack against Document Protection Systems Based on Digital Watermarking -- Second Generation Benchmarking and Application Oriented Evaluation -- Robust Covert Communication over a Public Audio Channel Using Spread Spectrum -- Hiding Association Rules by Using Confidence and Support -- How to Break a Semi-anonymous Fingerprinting Scheme -- An Analysis of One of the SDMI Candidates.

This book constitutes the thoroughly refereed post-proceedings of the 4th International Information Hiding Workshop, IHW 2001, held in Pittsburgh, PA, USA, in April 2001. The 29 revised full papers presented were carefully selected during two rounds of reviewing and revision. All current issues in information hiding are addressed including watermarking and fingerprinting of digitial audio, still image and video; anonymous communications; steganography and subliminal channels; covert channels; and database inference channels.