Computer Security Resource Center

Computer Security Resource Center

Computer Security
Resource Center

Glossary

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Block Cipher

Acronym(s):

None

Definition(s):

  An invertible symmetric-key cryptographic algorithm that operates on fixed-length blocks of input using a secret key and an unvarying transformation algorithm. The resulting output block is the same length as the input block.
Source(s): NIST SP 800-107 (Superceded by Rev. 1)

  A family of functions and their inverse functions that is parameterized by cryptographic keys; the functions map bit strings of a fixed length to bit strings of the same length.
Source(s): NIST SP 800-135 Rev. 1
NIST SP 800-38A

  A symmetric-key cryptographic algorithm that transforms one block of information at a time using a cryptographic key. For a block cipher algorithm, the length of the input block is the same as the length of the output block.
Source(s): NIST SP 800-90A Rev. 1

  An algorithm for a parameterized family of permutations on bit strings of a fixed length.
Source(s): NIST SP 800-38B

  A parameterized family of permutations on bit strings of a fixed length; the parameter that determines the permutation is a bit string called the key.
Source(s): NIST SP 800-38D
NIST SP 800-38F

Synonym(s):

None

See Also: