US PATENT SUBCLASS 380 / 42
.~ Data stream/substitution enciphering

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
42.~ Data stream/substitution enciphering {2}
43  DF  .~.~> Key sequence signal combined with data signal
44  DF  .~.~> With particular key generator {3}

DEFINITION

Classification: 380/42

Data stream/substitution enciphering:

(under subclass 9) Subject matter which encrypts a message signal composed of a stream of data elements serially and continuously to produce a stream of the corresponding encrypted data elements.

(1) Note. The encryption may be performed by either modification of substitution of the data stream elements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37, for this subject matter combined with time segment interchange.