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.