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Inverse Cipher Operation/Inverse Transformation

Definition(s):

  The block cipher algorithm function that is the inverse of the forward cipher function. The term “inverse cipher operation” is used for TDEA, while the term “inverse transformation” is used for DEA.
Source(s):
NIST SP 800-67 Rev. 2
NIST SP 800-67 Rev. 1 [Superseded]