I think it was Bruce Schneir in the Cryptonomicon appendix (someone correct me if I'm wrong) who said something along the lines of "anyone can come up with a ci

I think it was Bruce Schneir in the Cryptonomicon appendix (someone correct me if I'm wrong) who said something along the lines of "anyone can come up with a cipher that they couldn't imagine breaking, and then think it's unbreakable". That captures it so well.