Class 380 cryptography | |
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uspc | description |

380/1 | 380 cryptography/(1) cryptanalysis |

380/2 | 380 cryptography/(2) equipment test or malfunction indication |

380/200 | 380 cryptography/(200) video cryptography |

380/201 | 380 cryptography/(200) video cryptography (201) copy protection or prevention |

380/202 | 380 cryptography/(200) video cryptography (201) copy protection or prevention (202) having origin or program id |

380/203 | 380 cryptography/(200) video cryptography (201) copy protection or prevention (203) having copy protect signal |

380/204 | 380 cryptography/(200) video cryptography (201) copy protection or prevention (204) modifying sync signal |

380/205 | 380 cryptography/(200) video cryptography (205) video electric signal masking |

380/206 | 380 cryptography/(200) video cryptography (205) video electric signal masking (206) masking of synchronization signal |

380/207 | 380 cryptography/(200) video cryptography (205) video electric signal masking (207) including locally generated masking signal |

380/208 | 380 cryptography/(200) video cryptography (205) video electric signal masking (208) including filter for removing masking signal |

380/209 | 380 cryptography/(200) video cryptography (205) video electric signal masking (209) masking signal selectively addressed |

380/210 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) |

380/211 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (211) interactive tv |

380/212 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (212) plural video stream multiplexing |

380/213 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (213) chrominance scrambling |

380/214 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (214) nonstandard scan pattern of video information |

380/215 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (214) nonstandard scan pattern of video information (215) line cut and shuffle |

380/216 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (216) image data converted to digital before modification |

380/217 | 380 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) |

380/218 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (218) variable time delay modulation of baseband video signal |

380/219 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (219) carrier phase shift |

380/220 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (220) carrier frequency conversion |

380/221 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal |

380/222 | 380 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 |

380/223 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (223) key signal on separate carrier |

380/224 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (224) including pseudo-synchronizing pulse |

380/225 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (225) self-synchronizing circuit at receiver |

380/226 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (221) by modifying synchronizing signal (226) key signal in blanking interval |

380/227 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled |

380/228 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled (228) including key on record |

380/229 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled (229) including authentication |

380/230 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (227) record or coin controlled (230) including usage recording |

380/231 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination |

380/232 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination (232) including authentication |

380/233 | 380 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 |

380/234 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (231) usage or charge determination (234) including display of supplemental information |

380/235 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (235) phase inversion of scan line information |

380/236 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (236) modifying accompanying audio signal |

380/237 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (236) modifying accompanying audio signal (237) including digital audio |

380/238 | 380 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 |

380/239 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (239) encrypted code control signal |

380/240 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (240) including addressed decoder control signal |

380/241 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (240) including addressed decoder control signal (241) having program id or authorization |

380/242 | 380 cryptography/(200) video cryptography (210) video electric signal modification (e.g., scrambling) (240) including addressed decoder control signal (242) having command signal for receiver |

380/243 | 380 cryptography/(243) facsimile cryptography |

380/244 | 380 cryptography/(243) facsimile cryptography (244) synchronization |

380/245 | 380 cryptography/(243) facsimile cryptography (245) nonstandard scan pattern |

380/246 | 380 cryptography/(243) facsimile cryptography (246) including generation of an associated coded record |

380/247 | 380 cryptography/(247) cellular telephone cryptographic authentication |

380/248 | 380 cryptography/(247) cellular telephone cryptographic authentication (248) visiting center |

380/249 | 380 cryptography/(247) cellular telephone cryptographic authentication (249) initialization |

380/250 | 380 cryptography/(247) cellular telephone cryptographic authentication (250) usage pattern detection |

380/251 | 380 cryptography/(251) electronic game using cryptography |

380/252 | 380 cryptography/(252) electric signal masking |

380/253 | 380 cryptography/(252) electric signal masking (253) by signal having discrete frequency component |

380/254 | 380 cryptography/(252) electric signal masking (254) by signal having discrete step amplitude variation |

380/255 | 380 cryptography/(255) communication system using cryptography |

380/256 | 380 cryptography/(255) communication system using cryptography (256) fiber optic network |

380/257 | 380 cryptography/(255) communication system using cryptography (257) circuit switched network (e.g., wired telephone) |

380/41 | 380 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) |

380/258 | 380 cryptography/(255) communication system using cryptography (258) position dependent or authenticating |

380/259 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography |

380/260 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization |

380/261 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization (261) including frame synchronization |

380/262 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization (262) transmitting a seed, sequence, or initial value |

380/263 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (260) symmetric key synchronization (263) nonlinear or chaotic system |

380/264 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (264) key derived from addressable memory element |

380/265 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (265) combining outputs of shift register |

380/266 | 380 cryptography/(255) communication system using cryptography (259) symmetric key cryptography (266) including a modem |

380/267 | 380 cryptography/(255) communication system using cryptography (267) correcting for random appearance of control character code |

380/268 | 380 cryptography/(255) communication system using cryptography (268) pseudo-random sequence scrambling |

380/269 | 380 cryptography/(255) communication system using cryptography (269) having compression |

380/270 | 380 cryptography/(255) communication system using cryptography (270) wireless communication |

380/271 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (271) having receiver selection (e.g., pager) |

380/272 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (272) including hand-off based cryptographic alteration |

380/273 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (273) rekeying system |

380/31 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (31) plural modulation of single carrier |

380/32 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (31) plural modulation of single carrier (32) wobbling of carrier |

380/33 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (33) using plural paths or channels |

380/34 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (33) using plural paths or channels (34) plural carrier frequencies |

380/274 | 380 cryptography/(255) communication system using cryptography (270) wireless communication (274) synchronization |

380/35 | 380 cryptography/(255) communication system using cryptography (35) variable time delay modulation |

380/36 | 380 cryptography/(255) communication system using cryptography (36) time segment interchange |

380/37 | 380 cryptography/(255) communication system using cryptography (36) time segment interchange (37) block/data stream enciphering |

380/38 | 380 cryptography/(255) communication system using cryptography (38) frequency shift or inversion |

380/39 | 380 cryptography/(255) communication system using cryptography (38) frequency shift or inversion (39) having plural band pass filters |

380/40 | 380 cryptography/(255) communication system using cryptography (40) having plural band pass filters |

380/42 | 380 cryptography/(255) communication system using cryptography (42) data stream/substitution enciphering |

380/43 | 380 cryptography/(255) communication system using cryptography (42) data stream/substitution enciphering (43) key sequence signal combined with data signal |

380/275 | 380 cryptography/(255) communication system using cryptography (275) speech scrambler detail |

380/276 | 380 cryptography/(255) communication system using cryptography (275) speech scrambler detail (276) including sampling |

380/277 | 380 cryptography/(277) key management |

380/278 | 380 cryptography/(277) key management (278) key distribution |

380/279 | 380 cryptography/(277) key management (278) key distribution (279) key distribution center |

380/280 | 380 cryptography/(277) key management (278) key distribution (279) key distribution center (280) control vector or tag |

380/281 | 380 cryptography/(277) key management (278) key distribution (279) key distribution center (281) using master key (e.g., key-encrypting-key) |

380/282 | 380 cryptography/(277) key management (278) key distribution (279) key distribution center (282) by public key method |

380/283 | 380 cryptography/(277) key management (278) key distribution (283) user-to-user key distributed over data link (i.e., no center) |

380/284 | 380 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) |

380/285 | 380 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 |

380/286 | 380 cryptography/(277) key management (286) key escrow or recovery |

380/44 | 380 cryptography/(277) key management (44) having particular key generator |

380/45 | 380 cryptography/(277) key management (44) having particular key generator (45) multiple key level |

380/46 | 380 cryptography/(277) key management (44) having particular key generator (46) nonlinear (e.g., pseudorandom) |

380/47 | 380 cryptography/(277) key management (44) having particular key generator (47) plural generators |

380/28 | 380 cryptography/(28) particular algorithmic function encoding |

380/29 | 380 cryptography/(28) particular algorithmic function encoding (29) nbs/des algorithm |

380/30 | 380 cryptography/(28) particular algorithmic function encoding (30) public key |

380/287 | 380 cryptography/(287) electric signal modification |

380/22 | 380 cryptography/(287) electric signal modification (22) having magnetic record carrier (e.g., tape, drum) |

380/26 | 380 cryptography/(287) electric signal modification (26) having mechanical control of signal encryption (e.g., cam) |

380/27 | 380 cryptography/(287) electric signal modification (26) having mechanical control of signal encryption (e.g., cam) (27) by perforated record |

380/51 | 380 cryptography/(287) electric signal modification (51) having production of printed copy (e.g., printer, typewriter) |

380/52 | 380 cryptography/(287) electric signal modification (52) including particular structure or housing (e.g., display, keyboard) |

380/53 | 380 cryptography/(287) electric signal modification (52) including particular structure or housing (e.g., display, keyboard) (53) audio transducer mounting or structure |

380/54 | 380 cryptography/(54) by modifying optical image (e.g., transmissive overlay) |

380/55 | 380 cryptography/(55) having production of printed copy (e.g., cryptographic printer or typewriter) |

380/56 | 380 cryptography/(56) selectively movable element having code characters |

380/57 | 380 cryptography/(56) selectively movable element having code characters (57) rotatable |

380/58 | 380 cryptography/(56) selectively movable element having code characters (57) rotatable (58) characters on peripheral surface (e.g., cylinder section) |

380/59 | 380 cryptography/(59) miscellaneous |

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