US PATENT SUBCLASS 380 / 45
.~.~.~ Multiple key level

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
42  DF  .~ Data stream/substitution enciphering {2}
44  DF  .~.~ With particular key generator {3}
45.~.~.~ Multiple key level

DEFINITION

Classification: 380/45

Multiple key level:

(under subclass 44) Subject matter including plural encrypting or decrypting stages each of which has a separate key.