The IEEE International Workshop on Information Forensics and Security (WIFS) is the primary annual event organized by the IEEE Information Forensics and Security Technical Committee (IFS TC). WIFS is an avenue for knowledge exchange that encompasses a broad range of disciplines and facilitates the flow of ideas between various disparate communities that constitute information security. With this focus, we hope that researchers will identify new opportunities for collaboration across disciplines and gain new perspectives. The 4th edition of the WIFS workshop will be held in Tenerife, Spain, on December 2-5, 2012. The conference will feature prominent keynote speakers, tutorials, and lecture sessions. Topics of interest include, but are not limited to: security and privacy analysis, forensic analysis, biometrics, cryptography for multimedia, watermarking and data hiding, video surveillance, digital rights Management, content identification... Tutorial proposal are due May 10, 2012; full paper proposals (4-6 pages) are due June 24, 2012; and demonstration proposals are due July 8, 2012. For more information, please visit WIFS'12 website.