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Boolean Function Nonlinearity - http://www.ciphersbyritter.com/JAVASCRP/NONLMEAS.HTM
A detailed discussion of cryptographic nonlinearity, what it means and how it is computed, with active JavaScript panels to perform the computation. |
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Cryptodox - http://www.cryptodox.com/
A community wiki. Basic cryptography theory and information security resources. |
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Introduction to Cryptography - http://www.ssh.com/support/cryptography/introduction/
Elementary information on cryptographic theory, digital signatures, protocols, and cryptanalysis. |