CIPHERTEXT: The encrypted form of the PLAINTEXT.
CODE: An unvarying rule for replacing a piece of information with another object, not necessarily of the same sort e.g. ASCII.
CRYPTANALYSIS: The science (and art) of recovering information from ciphers without knowledge of the key.
CRYPTOGRAPHY: The science of the enciphering and deciphering of messages in secret code or cipher.
CRYPTOSYSTEM: A system for encrypting information.
DECRYPTION: The process of converting the CIPHER back into PLAINTEXT.
ENCRYPTION: The process of converting the PLAINTEXT into a CIPHER.
KEY: The secret information known only to the transmitter and the receiver which is used to secure the PLAINTEXT.
MONOALPHABETIC SUBSTITUTION: A method of encryption where a letter in the plaintext is always replaced by the same letter in the ciphertext.
PLAINTEXT: The source information to be secured.
POLYALPHABETIC SUBSTITUTION: A method of encryption where a letter in the plaintext is not always replaced by the same letter in the ciphertext.
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