Schneier's Law

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The term "Schneier's Law" was coined by Cory Doctorow in his speech about Digital Rights Management for Microsoft Research.[1] The law is phrased as:

Any person can invent a security system so clever that she or he can't think of how to break it.

He attributes this to Bruce Schneier, presumably making reference to his book Applied Cryptography, althought the principle predates its publication. In The Codebreakers, David Kahn states:

Few false ideas have more firmly gripped the minds of so many intelligent men than the one that, if they just tried, they could invent a cipher that no one could break.

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