Cryptography Patents (Class 380)

Cryptanalysis (Class 380/1)

Equipment test or malfunction indication (Class 380/2)

Video cryptography (Class 380/200)

Facsimile cryptography (Class 380/243)

Cellular telephone cryptographic authentication (Class 380/247)

Electronic game using cryptography (Class 380/251)

Electric signal masking (Class 380/252)

Communication system using cryptography (Class 380/255)

Key management (Class 380/277)

Particular algorithmic function encoding (Class 380/28)

Electric signal modification (Class 380/287)

By modifying optical image (e.g., transmissive overlay) (Class 380/54)

Having production of printed copy (e.g., cryptographic printer or typewriter) (Class 380/55)

Selectively movable element having code characters (Class 380/56)

Miscellaneous (Class 380/59)

Class-related foreign documents (Class 380/FOR000)

Stored information access or copy prevention (380/3) (Class 380/FOR103)

Electric signal masking (380/6) (Class 380/FOR106)

Electric signal modification (e.g., scrambling) (380/9) (Class 380/FOR109)