The German, British and Russian governments are all re-equipping most of their agencies where sensitive data is produced and stored with the retro document machine--the typewriter. The only way this piece of archaic tech can be hacked from the Cold War days was to place a tiny microphone inside each machine and record the keystrokes. Since tech is screened like a sieve these days, it's safe to say that the hum of a tyewriter will be safe wherever you use it.