Global terrorism is increasingly characterized by online activity, while counterterrorism requires understanding an adversary’s new media and cyber capabilities. Terror organizations hack and tweet in order to recruit, fundraise, promote ideologies, and coordinate kinetic attacks. With that in mind, the Digital Futures Project is compiling a timeline of milestones in digital terrorism, including the release of encryption programs and OpSec manuals for jihadists, data breaches and doxes, and other incidents. Entries are tagged with keywords and followed by brief summaries.