Since the mid 1990s, data hiding has been proposed as an enabling technology for securing multimedia communication and is now used in various applications including broadcast monitoring, movie fingerprinting, steganography, video indexing and retrieval and image authentication. Data hiding and cryptographic techniques are often combined to complement each other, thus triggering the development of a new research field of multimedia security. Besides, two related disciplines, steganalysis and data forensics, are increasingly attracting researchers and becoming another new research field of multimedia security. This journal, LNCS Transactions on Data Hiding and Multimedia Security, aims to be a forum for all researchers in these emerging fields, publishing both original and archival research results. The six papers included in this issue deal with watermarking security, perceptual image hashing, infrared hiding, steganography and steganalysis.

Strengthening Spread Spectrum Watermarking Security via Key Controlled Wavelet Filter.- Wave Atom-Based Perceptual Image Hashing Against Content-Preserving and Content-Altering Attacks.- IR Hiding: Use of Specular Reflection for Short-Wavelength-Pass-Filter Detection to Prevent Re-recording of Screen Images.- A Reliable Covert Communication Scheme Based on VoIP Steganography.- Adaptive Steganography and Steganalysis with Fixed-Size Embedding.- Permutation Steganography in FAT File systems.