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Class Information
Number: 380/20
Name: Cryptography >

Sub-classes under this class:

Class Number Class Name Patents
380/1 Cryptanalysis 124
380/2 Equipment test or malfunction indication 182
380/200 Video cryptography 650
380/243 Facsimile cryptography 196
380/247 Cellular telephone cryptographic authentication 734
380/251 Electronic game using cryptography 143
380/252 Electric signal masking 210
380/255 Communication system using cryptography 1,061
380/277 Key management 2,367
380/28 Particular algorithmic function encoding 2,135
380/287 Electric signal modification 154
380/54 By modifying optical image (e.g., transmissive overlay) 514
380/55 Having production of printed copy (e.g., cryptographic printer or typewriter) 235
380/56 Selectively movable element having code characters 38
380/59 Miscellaneous 259

Patents under this class:

Patent Number Title Of Patent Date Issued

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