As the introduction to the excellent Matasano Crypto Challenges says,
There are tens, probably hundreds, of obscure little things you can do to take a cryptosystem that should be secure even against an adversary with more CPU cores than there are atoms in the solar system, and make it solvable with a Perl script and 15 seconds.
google-chrome --cipher-suite-blacklist=0x0033,0x0039,0x009E,0xcc15
Designing a crypto protocol is extremely costly due to the careful review that is required and the huge potential damage if a flaw is found. Instead of incurring that cost, it’s often better to keep state on the server or use well-reviewed libraries that provide SSL or GPG interfaces. There are no flaws in the crypto you avoid implementing.
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