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  • output feedback (OFB)

    In cryptography, output feedback (OFB) is a mode of operation for a block cipher. 

  • ciphertext feedback (CFB)

    Ciphertext feedback (CFB) is a mode of operation for a block cipher. In contrast to the cipher block chaining (CBC) mode, which encrypts a set number of bits of plaintext at a time, it is at times desirable to encrypt and transfer some plaintext valu... 

  • decipher

    All three terms - decipher, decrypt, and decode - mean to convert ciphertext into the original, unencrypted plaintext. 

  • Electronic Code Book (ECB)

    Electronic Code Book (ECB) is a mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value and vice versa. 

  • crypto

    Depending on its usage, crypto can be a short form for cryptography or for encryption. 

  • stream cipher

    A stream cipher is a method of encrypting text (to produce ciphertext) in which a cryptographic key and algorithm are applied to each binary digit in a data stream, one bit at a time. 

  • Pretty Good Privacy (PGP)

    Pretty Good Privacy (PGP) is a popular program used to encrypt and decrypt e-mail over the Internet. 

  • quantum cryptography

    Quantum cryptography uses our current knowledge of physics to develop a cryptosystem that is not able to be defeated - that is, one that is completely secure against being compromised without knowledge of the sender or the receiver of the messages. 

  • cryptology

    Cryptology is the mathematics, such as number theory, and the application of formulas and algorithms, that underpin cryptography and cryptanalysis. 

  • session key

    A session key is an encryption and decryption key that is randomly generated to ensure the security of a communications session between a user and another computer or between two computers.