Unless things have changed significantly since I was in the Navy (doubtful), they still use things like this to store crypto keys: http://en.wikipedia.org/wiki/

Unless things have changed significantly since I was in the Navy (doubtful), they still use things like this to store crypto keys: http://en.wikipedia.org/wiki/AN/CYZ-10 http://en.wikipedia.org/wiki/AN/CYZ-10