Explore cutting-edge research in multimedia security with “Transactions on Data Hiding and Multimedia Security III: 4920” from The Bookish Owl. Since the 1990s, data hiding has revolutionized multimedia security, finding applications in broadcast monitoring, steganography, and image authentication. This essential volume delves into the fusion of data hiding and cryptography, fostering the growth of multimedia security. Discover advancements in steganalysis and data forensics. This third issue presents five pivotal contributions, covering steganographic system security, novel steganographic schemes, digital watermarking, covert channels, and the analysis of additive attacks on quantization-based data hiding. A must-read for researchers and practitioners in computer science and information security.