Re: The Holy Trinity
"Unless you can make it turnkey easy AND bulletproof at the same time (which I bet you can't--security and ease of use tend to be on opposite ends of the scale: see front doors), there WILL be weaknesses that a state (where money isn't always an object) can exploit."
Football matches are pretty loud - you can probably communicate with your criminal compatriots by word of mouth at one of those without too much difficulty, provided you use a (not necessarily too complex) code.
I believe spies/secret agents used to talk to each other F2F in bathrooms with the shower/bath taps running in the days before email/IRC/Facebook.
It may not be bulletproof: I may be wrong but football scarves aren't generally so to the best of my knowledge and it might be a good idea to plan your crimes in countries where the police/locals aren't armed (just in case, you know).
But, unless one (or more) of you is deaf/mute, It's pretty easy - I'd go so far as to say 'turnkey easy' myself.
Biting the hand that feeds IT
