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Cipher feedback (CFB)
A block cipher mode which improves electronic codebook mode because it chains together the blocks of ciphertext it makes. It also operates on plaintext sections of all different lengths equal to or less than the block length.
Ciphertext
An string of data that appears to be completely haphazard. Like text that is encrypted or been through SSL encryption, ciphertext carries little or no information to an entity that is unauthorized. An original message or plaintext, however, can be pulled out with an appropriate key and algorithm that decrypts with SSL decryption.
Ciphertext-only attack
A form of cryptanalysis where the cryptanalyst has some ciphertext but nothing else.
Classification
An assembly of classified information to which a hierarchical, restrictive security label is attached in order to heighten the protection of the data, which provides network security and online security.
Also the level of protection required in order to apply certain information.
Classified
Information officially mandated by a security policy that is to be given data confidentiality service and is to be denoted with a special security label in order to signify the status of its protection.