US Patent Class 380
CRYPTOGRAPHY-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  CRYPTANALYSIS
2  DF  EQUIPMENT TEST OR MALFUNCTION INDICATION
3  DF  STORED INFORMATION ACCESS OR COPY PREVENTION {2}
6  DF  ELECTRIC SIGNAL MASKING {2}
9  DF  ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) {18}
54  DF  BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY)
55  DF  WITH PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER)
56  DF  SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS {1}
59  DF  MISCELLANEOUS