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Protocols

A protocol is a series of steps taken to accomplish a task. In fact, this is also the definition of an algorithm, but we use algorithm to refer to the attainment of internal, mathematical results such as encrypting a block, and protocol to refer to the attainment of user-visible results such as secret communication and digital signatures.

Communications

Obviously, most of the previous discussion of secret-key and public-key cryptosystems has been about their use in communications, but complete application of cryptography to communications also addresses some issues beyond the simple encryption and decryption of blocks.


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