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CISSP Training Kit by David R. Miller

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The basics of cryptography

Cryptology is the study of all things crypto. This includes cryptography, the process of hiding the meaning of a message and revealing it at a later time, as well as cryptanalysis, cryptographic algorithms, cryptosystems, and key management, for example.

Although contemporary cryptosystems use many components and processes, strictly speaking, cryptography requires three components to operate:

  • A cipher (also called an algorithm). A data manipulation process

  • A key (also called a cryptovariable). Kept secret and used to impose a unique randomness on the message

  • A plaintext message. In need of protection

Encryption converts the plaintext message into ciphertext. The plaintext message is processed by the cipher, and the processing ...

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