US PATENT SUBCLASS 380 / 43
.~.~ Key sequence signal combined with data signal

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}
43.~.~ Key sequence signal combined with data signal

DEFINITION

Classification: 380/43

Key sequence signal combined with data signal:

(under subclass 42) Subject matter wherein a predetermined sequence of digital signals is combined element-for-element with the message signal data elements to produce an encrypted or decrypted signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21, for transmission or distribution of the key signal.