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Amateurs Produce Amateur Cryptography
Anyone can design a cipher that he himself cannot break. This is why you should uniformly distrust amateur cryptography, and why you should only use published algorithms that have withstood broad cryptanalysis. All cryptographers know this, but non-cryptographers do not. And this is why we repeatedly see bad amateur cryptography in fielded systems.
The latest is the cryptography in the Open Smart Grid Protocol, which is so bad as to be laughable. From the paper:
The link for this article located at Schneier on Security is no longer available.