It drives me fucking bananas when people compare "breaking" to "criticizing" and "building" to "creating". Tell that to Don Coppersmith or Daniel Bleichenbacher.

Anybody can create a block cipher. Anybody can create a new encrypted transport. It's far easier to cough up a crappy new design than it is to break even a mediocre one.

But, more importantly, "breaking" a cryptosystem isn't "destructive". It's the most productive thing you can do to crypto. You can't prove a negative. All you can do is spot the designs we can know we shouldn't be using.

"Any idiot can break a window". Sheesh. Have you ever coded a crypto attack? Would you like me to send you a model problem, Jacques?