3 May
2005
3 May
'05
4:15 p.m.
And then, of course, in the off chance they can't actually break the message under that flag, they can merely send a guy out with binoculars or whatever.
Don't forget about rubber-hose cryptanlysis. Rumour has it that method is preferred in many cases since it makes the code-breakers feel good by way of testosterone release.
Guns. You may not be able to kill them, but you may be able to force them to kill you.