In (rec.radio.amateur.homebrew), phil hunt wrote:

Modern crypto is good enough to withstand all cryptanalytic
attacks.

That's a great idea, and I suspect tthat you're right in the general
case. But a modern cryptosystem, badly implemented, will have all
manner of vulnerabilities -- most of which are not particularly
obvious.

Remember the competition for the successor to DES as the standard
crypto algorithm? That was *quite* interesting.

--
"Remember: every member of your 'target audience' also owns a broadcasting
station. These 'targets' can shoot back."
-- Michael Rathbun to advertisers, in nanae