US PATENT SUBCLASS 380 / 27
.~.~ By perforated record

Current as of: June, 1999
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380 /   HD   CRYPTOGRAPHY

9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
26  DF  .~ With mechanical control of signal encryption (e.g., cam) {1}
27.~.~ By perforated record

DEFINITION

Classification: 380/27

By perforated record:

(under subclass 26) Subject matter which controls cryptos:graphic signal modification in accordance with a pattern of openings along the length of an elongate web.

(1) Note. The elongate web may be a movable strip.

(2) Note. The pattern of perforations may supply the encryption key.