The Perfect Cipher: the one time pad.

Is there such a thing as a perfect cipher? Yes, but using it is rather impractical. But it is nice to know such a thing exists. Here is a nice explanation of the one time pad.

Khan Academy: One time pad

If you are interested in cryptography, the OU Math Department offers a math elective, Math 4483: Applied Modern Algebra, which usually includes cryptography.

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