US Patent Class 380-- CRYPTOGRAPHY-- MAIN HEADINGS

US Patent Class 380
CRYPTOGRAPHY-- Main Headings

		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