The 12-th International Workshop on Digital-forensics and Watermarking (IWDW 2013) is to be held at CBD Auckland, New Zealand. IWDW 2013 is a premier forum for researchers and practitioners working on novel research, development and applications of digital watermarking and forensics techniques for multimedia security. We invite submissions of high-quality original research papers. Each submitted paper will be reviewed by at least two reviewers. Two prizes are to be awarded for the best paper and the best student paper, respectively. The proceedings of IWDW13 will be published on the Lecture Notes in Computer Science (LNCS) by Springer.