Edward Snowden has set up a dead man’s switch. He’s distributed encrypted copies of his document trove to various people, and has set up some sort of automatic system to distribute the key, should something happen to him. [..] I’m not sure he’s thought this through, though. I would be more worried that someone would kill me in order to get the documents released than I would be that someone would kill me to prevent the documents from being released.

Schneier on Security: Snowden’s Dead Man’s Switch