USPC Patent Classifications

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Class 380 cryptography
uspcdescription
380/1380 cryptography/(1) cryptanalysis
380/2380 cryptography/(2) equipment test or malfunction indication
380/200380 cryptography/(200) video cryptography
380/201380 cryptography/(200) video cryptography (201) copy protection or prevention
380/202380 cryptography/(200) video cryptography (201) copy protection or prevention (202) having origin or program id
380/203380 cryptography/(200) video cryptography (201) copy protection or prevention (203) having copy protect signal
380/204380 cryptography/(200) video cryptography (201) copy protection or prevention (204) modifying sync signal
380/205380 cryptography/(200) video cryptography (205) video electric signal masking
380/206380 cryptography/(200) video cryptography (205) video electric signal masking (206) masking of synchronization signal
380/207380 cryptography/(200) video cryptography (205) video electric signal masking (207) including locally generated masking signal
380/208380 cryptography/(200) video cryptography (205) video electric signal masking (208) including filter for removing masking signal
380/209380 cryptography/(200) video cryptography (205) video electric signal masking (209) masking signal selectively addressed
380/210380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling)
380/211380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (211) interactive tv
380/212380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (212) plural video stream multiplexing
380/213380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (213) chrominance scrambling
380/214380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (214) nonstandard scan pattern of video information
380/215380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (214) nonstandard scan pattern of video information (215) line cut and shuffle
380/216380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (216) image data converted to digital before modification
380/217380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (216) image data converted to digital before modification (217) having compression (e.g., mpeg)
380/218380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (218) variable time delay modulation of baseband video signal
380/219380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (219) carrier phase shift
380/220380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (220) carrier frequency conversion
380/221380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal
380/222380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (222) including phase inversion of scan line information
380/223380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (223) key signal on separate carrier
380/224380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (224) including pseudo-synchronizing pulse
380/225380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (225) self-synchronizing circuit at receiver
380/226380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (226) key signal in blanking interval
380/227380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled
380/228380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled (228) including key on record
380/229380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled (229) including authentication
380/230380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled (230) including usage recording
380/231380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination
380/232380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination (232) including authentication
380/233380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination (233) including usage or charge recording at subscriber station
380/234380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination (234) including display of supplemental information
380/235380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (235) phase inversion of scan line information
380/236380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (236) modifying accompanying audio signal
380/237380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (236) modifying accompanying audio signal (237) including digital audio
380/238380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (236) modifying accompanying audio signal (238) including frequency modification of audio signal or frequency shifting of audio carrier
380/239380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (239) encrypted code control signal
380/240380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (240) including addressed decoder control signal
380/241380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (240) including addressed decoder control signal (241) having program id or authorization
380/242380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (240) including addressed decoder control signal (242) having command signal for receiver
380/243380 cryptography/(243) facsimile cryptography
380/244380 cryptography/(243) facsimile cryptography (244) synchronization
380/245380 cryptography/(243) facsimile cryptography (245) nonstandard scan pattern
380/246380 cryptography/(243) facsimile cryptography (246) including generation of an associated coded record
380/247380 cryptography/(247) cellular telephone cryptographic authentication
380/248380 cryptography/(247) cellular telephone cryptographic authentication (248) visiting center
380/249380 cryptography/(247) cellular telephone cryptographic authentication (249) initialization
380/250380 cryptography/(247) cellular telephone cryptographic authentication (250) usage pattern detection
380/251380 cryptography/(251) electronic game using cryptography
380/252380 cryptography/(252) electric signal masking
380/253380 cryptography/(252) electric signal masking (253) by signal having discrete frequency component
380/254380 cryptography/(252) electric signal masking (254) by signal having discrete step amplitude variation
380/255380 cryptography/(255) communication system using cryptography
380/256380 cryptography/(255) communication system using cryptography (256) fiber optic network
380/257380 cryptography/(255) communication system using cryptography (257) circuit switched network (e.g., wired telephone)
380/41380 cryptography/(255) communication system using cryptography (257) circuit switched network (e.g., wired telephone) (41) having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)
380/258380 cryptography/(255) communication system using cryptography (258) position dependent or authenticating
380/259380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography
380/260380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization
380/261380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization (261) including frame synchronization
380/262380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization (262) transmitting a seed, sequence, or initial value
380/263380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization (263) nonlinear or chaotic system
380/264380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (264) key derived from addressable memory element
380/265380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (265) combining outputs of shift register
380/266380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (266) including a modem
380/267380 cryptography/(255) communication system using cryptography (267) correcting for random appearance of control character code
380/268380 cryptography/(255) communication system using cryptography (268) pseudo-random sequence scrambling
380/269380 cryptography/(255) communication system using cryptography (269) having compression
380/270380 cryptography/(255) communication system using cryptography (270) wireless communication
380/271380 cryptography/(255) communication system using cryptography (270) wireless communication (271) having receiver selection (e.g., pager)
380/272380 cryptography/(255) communication system using cryptography (270) wireless communication (272) including hand-off based cryptographic alteration
380/273380 cryptography/(255) communication system using cryptography (270) wireless communication (273) rekeying system
380/31380 cryptography/(255) communication system using cryptography (270) wireless communication (31) plural modulation of single carrier
380/32380 cryptography/(255) communication system using cryptography (270) wireless communication (31) plural modulation of single carrier (32) wobbling of carrier
380/33380 cryptography/(255) communication system using cryptography (270) wireless communication (33) using plural paths or channels
380/34380 cryptography/(255) communication system using cryptography (270) wireless communication (33) using plural paths or channels (34) plural carrier frequencies
380/274380 cryptography/(255) communication system using cryptography (270) wireless communication (274) synchronization
380/35380 cryptography/(255) communication system using cryptography (35) variable time delay modulation
380/36380 cryptography/(255) communication system using cryptography (36) time segment interchange
380/37380 cryptography/(255) communication system using cryptography (36) time segment interchange (37) block/data stream enciphering
380/38380 cryptography/(255) communication system using cryptography (38) frequency shift or inversion
380/39380 cryptography/(255) communication system using cryptography (38) frequency shift or inversion (39) having plural band pass filters
380/40380 cryptography/(255) communication system using cryptography (40) having plural band pass filters
380/42380 cryptography/(255) communication system using cryptography (42) data stream/substitution enciphering
380/43380 cryptography/(255) communication system using cryptography (42) data stream/substitution enciphering (43) key sequence signal combined with data signal
380/275380 cryptography/(255) communication system using cryptography (275) speech scrambler detail
380/276380 cryptography/(255) communication system using cryptography (275) speech scrambler detail (276) including sampling
380/277380 cryptography/(277) key management
380/278380 cryptography/(277) key management (278) key distribution
380/279380 cryptography/(277) key management (278) key distribution (279) key distribution center
380/280380 cryptography/(277) key management (278) key distribution (279) key distribution center (280) control vector or tag
380/281380 cryptography/(277) key management (278) key distribution (279) key distribution center (281) using master key (e.g., key-encrypting-key)
380/282380 cryptography/(277) key management (278) key distribution (279) key distribution center (282) by public key method
380/283380 cryptography/(277) key management (278) key distribution (283) user-to-user key distributed over data link (i.e., no center)
380/284380 cryptography/(277) key management (278) key distribution (283) user-to-user key distributed over data link (i.e., no center) (284) using master key (e.g., key-encrypting-key)
380/285380 cryptography/(277) key management (278) key distribution (283) user-to-user key distributed over data link (i.e., no center) (285) by public key method
380/286380 cryptography/(277) key management (286) key escrow or recovery
380/44380 cryptography/(277) key management (44) having particular key generator
380/45380 cryptography/(277) key management (44) having particular key generator (45) multiple key level
380/46380 cryptography/(277) key management (44) having particular key generator (46) nonlinear (e.g., pseudorandom)
380/47380 cryptography/(277) key management (44) having particular key generator (47) plural generators
380/28380 cryptography/(28) particular algorithmic function encoding
380/29380 cryptography/(28) particular algorithmic function encoding (29) nbs/des algorithm
380/30380 cryptography/(28) particular algorithmic function encoding (30) public key
380/287380 cryptography/(287) electric signal modification
380/22380 cryptography/(287) electric signal modification (22) having magnetic record carrier (e.g., tape, drum)
380/26380 cryptography/(287) electric signal modification (26) having mechanical control of signal encryption (e.g., cam)
380/27380 cryptography/(287) electric signal modification (26) having mechanical control of signal encryption (e.g., cam) (27) by perforated record
380/51380 cryptography/(287) electric signal modification (51) having production of printed copy (e.g., printer, typewriter)
380/52380 cryptography/(287) electric signal modification (52) including particular structure or housing (e.g., display, keyboard)
380/53380 cryptography/(287) electric signal modification (52) including particular structure or housing (e.g., display, keyboard) (53) audio transducer mounting or structure
380/54380 cryptography/(54) by modifying optical image (e.g., transmissive overlay)
380/55380 cryptography/(55) having production of printed copy (e.g., cryptographic printer or typewriter)
380/56380 cryptography/(56) selectively movable element having code characters
380/57380 cryptography/(56) selectively movable element having code characters (57) rotatable
380/58380 cryptography/(56) selectively movable element having code characters (57) rotatable (58) characters on peripheral surface (e.g., cylinder section)
380/59380 cryptography/(59) miscellaneous

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