Mujahedeen Secrets (transliterated Arabic: Asrar al-Mujahedeen) is an encryption program for Microsoft Windows. It was publicly offered to supporters of Al-Qaeda as a tool to protect the confidentiality of their electronic messages.  The authors of the software are anonymous.
The software allows users to encrypt and decrypt text messages and files with a range of encryption techniques. This is primarily to ensure that any parties intercepting the messages during transmission, such as via Internet e-mail or cellphone, cannot easily view the message's contents.
- First release: In 2007, the Global Islamic Media Front, the propaganda arm of Al Qaeda and other Islamic terrorist groups, announced the release of the Mujahedeen Secrets software.
- Second release: In 2008, an updated version, Mujahideen Secrets 2, was released, offering further encryption methods.
- Schmiitt, Eric. "Qaeda Plot Leak Has Undermined U.S. Intelligence". New York Times. Retrieved 14 May 2014.