Guest Editorial: Supplement on Secure Media -- I.

This article presents information on the October 2004 issue of the IEEE Transactions on Signal Processing. This issue is the first among three supplements on secure media. It contains ten papers which covers a broad range of topics and were selected based on their high level of technical quality, mathematical rigor, significance and novelty. The topics include steganography, watermarking codes, temporal geometric robustness of video watermarks, cryptography for multimedia, performance analysis of biometric systems.