From CryptoDox, The Online Encyclopedia on Cryptography and Information Security

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Access control
Restricting information to those authorized for such access.
The encrypted message. The plaintext is converted to ciphertext during the process of encryption and vice-versa during decryption.
Greek for "hidden writing." It is the art and science of transforming information into a secure form
the art and science of obtaining the meaning of encrypted information, without access to the secret information which is normally required to do so.
Extracting information hidden by the process of encryption.
Hiding information in secret code.
The original message that needs to be encrypted. This is the message that has some value and should not be transmitted or stored as-is. (Sometimes referred to as cleartext)
Seclusion. Not being intruded upon. Information belonging to the individual, and not society at large. Related to secrecy.
A pattern that may appear to be unpredictable, but when given the same initial "seed" value again, always follows the same pattern as before. Used extensively in cryptography.
An unpredictable pattern. Random numbers are used extensively in cryptography.
Trust is the basis for communications secrecy: While secrecy can involve keeping one's own secrets, communications security almost inevitably involves at least a second party and the equipment itself. We thus necessarily "trust" that party with the secret, as well as cryptographic keys. It makes little sense to talk about secrecy in the absence of trust.

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