Have mate who is into the serious end of the security and protection gig. His wise words to me were fairly simple "the best system only buys the best time". What he was saying is that the best of the best only buys time before the inevitable. So it must apply to the "net". I think if "they" wanted to "get in", they could, just a matter of resources, time and money, i.e. the game must be worth the candle.
The other issue is that of "style", not just in the way a thing is constructed or even in the phrasing. Some folk can be 'picked' at about 10 words, perhaps not the actual identity but certainly the last name traded under. For example:-
Brutus: And since the quarrel
Will bear no color for the thing he is,
Fashion it thus: that what he is, augmented,
Would run to these and these extremities;
And therefore think him as a serpent's egg,
Which, hatch'd, would as his kind grow mischievous,
And kill him in the shell.
JC act 2, scene1.
Who else could it be?. 