US PATENT SUBCLASS 380 / 29
.~.~ NBS/DES algorithm

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
28  DF  .~ By particular algorithmic function encoding {2}
29.~.~ NBS/DES algorithm

DEFINITION

Classification: 380/29

NBS/DES algorithm:

(under subclass 28) Subject matter which encrypts a digital signal by a sequence including an initial 64-bit permutation, a 56-bit encryption-key dependent substitution block computation, and an inversion of the initial permutation.

(1) Note. The details of this encryption algorithm are published in the U.S. Government standard: Federal Information Processing Standard (FIPS) publication No. 46, January 15, 1977, U.S. National Bureau of Standards.