IdeaLogging. Deniability is only useful if you can expect your antagonist to respect (or at least be constrained by) certain norms of process, if you understand the actual norms in play, and if you can afford to invoke them. See also: [http://www.freedom-to-tinker.com/blog/paul/being-acquitted-versus-being-searched-yanal Being Acquitted Versus Being Searched], and [http://xkcd.com/538/ xkcd on security]. The world is full of people with wrenches, and some of them work for your government, if not for your employer, political opponent, or ostensible partner in crime.