| Subclass |
| Title |
|---|
|
ClassTitle
|
| ===>
CRYPTOGRAPHY
|
| | | |
| 1 | ![[Patents]](../gifs/ps.gif) | CRYPTANALYSIS |
| 2 | | EQUIPMENT TEST OR MALFUNCTION INDICATION |
| 200 | | VIDEO CRYPTOGRAPHY |
| 201 | | . Copy protection or prevention |
| 202 | | . . Having origin or program ID |
| 203 | | . . Having copy protect signal |
| 204 | | . . Modifying sync signal |
| 205 | | . Video electric signal masking |
| 206 | | . . Masking of synchronization signal |
| 207 | | . . Including locally generated masking signal |
| 208 | | . . Including filter for removing masking signal |
| 209 | | . . Masking signal selectively addressed |
| 210 | | . Video electric signal modification (e.g., scrambling) |
| 211 | | . . Interactive TV |
| 212 | | . . Plural video stream multiplexing |
| 213 | | . . Chrominance scrambling |
| 214 | | . . Nonstandard scan pattern of video information |
| 215 | | . . . Line cut and shuffle |
| 216 | | . . Image data converted to digital before modification |
| 217 | | . . . Having compression (e.g., MPEG) |
| 218 | | . . Variable time delay modulation of baseband video signal |
| 219 | | . . Carrier phase shift |
| 220 | | . . Carrier frequency conversion |
| 221 | | . . By modifying synchronizing signal |
| 222 | | . . . Including phase inversion of scan line information |
| 223 | | . . . Key signal on separate carrier |
| 224 | | . . . Including pseudo-synchronizing pulse |
| 225 | | . . . Self-synchronizing circuit at receiver |
| 226 | | . . . Key signal in blanking interval |
| 227 | | . . Record or coin controlled |
| 228 | | . . . Including key on record |
| 229 | | . . . Including authentication |
| 230 | | . . . Including usage recording |
| 231 | | . . Usage or charge determination |
| 232 | | . . . Including authentication |
| 233 | | . . . Including usage or charge recording at subscriber station |
| 234 | | . . . Including display of supplemental information |
| 235 | | . . Phase inversion of scan line information |
| 236 | | . . Modifying accompanying audio signal |
| 237 | | . . . Including digital audio |
| 238 | | . . . Including frequency modification of audio signal or frequency shifting of audio carrier |
| 239 | | . . Encrypted code control signal |
| 240 | | . . Including addressed decoder control signal |
| 241 | | . . . Having program ID or authorization |
| 242 | | . . . Having command signal for receiver |
| 243 | | FACSIMILE CRYPTOGRAPHY |
| 244 | | . Synchronization |
| 245 | | . Nonstandard scan pattern |
| 246 | | . Including generation of an associated coded record |
| 247 | | CELLULAR TELEPHONE CRYPTOGRAPHIC AUTHENTICATION |
| 248 | | . Visiting center |
| 249 | | . Initialization |
| 250 | | . Usage pattern detection |
| 251 | | ELECTRONIC GAME USING CRYPTOGRAPHY |
| 252 | | ELECTRIC SIGNAL MASKING |
| 253 | | . By signal having discrete frequency component |
| 254 | | . By signal having discrete step amplitude variation |
| 255 | | COMMUNICATION SYSTEM USING CRYPTOGRAPHY |
| 256 | | . Fiber optic network |
| 257 | | . Circuit switched network (e.g., wired telephone) |
| 41 | | . . Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry) |
| 258 | | . Position dependent or authenticating |
| 259 | | . Symmetric key cryptography |
| 260 | | . . Symmetric key synchronization |
| 261 | | . . . Including frame synchronization |
| 262 | | . . . Transmitting a seed, sequence, or initial value |
| 263 | | . . . Nonlinear or chaotic system |
| 264 | | . . Key derived from addressable memory element |
| 265 | | . . Combining outputs of shift register |
| 266 | | . . Including a modem |
| 267 | | . Correcting for random appearance of control character code |
| 268 | | . Pseudo-random sequence scrambling |
| 269 | | . Having compression |
| 270 | | . Wireless communication |
| 271 | | . . Having receiver selection (e.g., pager) |
| 272 | | . . Including hand-off based cryptographic alteration |
| 273 | | . . Rekeying system |
| 31 | | . . Plural modulation of single carrier |
| 32 | | . . . Wobbling of carrier |
| 33 | | . . Using plural paths or channels |
| 34 | | . . . Plural carrier frequencies |
| 274 | | . . Synchronization |
| 35 | | . Variable time delay modulation |
| 36 | | . Time segment interchange |
| 37 | | . . Block/data stream enciphering |
| 38 | | . Frequency shift or inversion |
| 39 | | . . Having plural band pass filters |
| 40 | | . Having plural band pass filters |
| 42 | | . Data stream/substitution enciphering |
| 43 | | . . Key sequence signal combined with data signal |
| 275 | | . Speech scrambler detail |
| 276 | | . . Including sampling |
| 277 | | KEY MANAGEMENT |
| 278 | | . Key distribution |
| 279 | | . . Key distribution center |
| 280 | | . . . Control vector or tag |
| 281 | | . . . Using master key (e.g., key-encrypting-key) |
| 282 | | . . . By public key method |
| 283 | | . . User-to-user key distributed over data link (i.e., no center) |
| 284 | | . . . Using master key (e.g., key-encrypting-key) |
| 285 | | . . . By public key method |
| 286 | | . Key escrow or recovery |
| 44 | | . Having particular key generator |
| 45 | | . . Multiple key level |
| 46 | | . . Nonlinear (e.g., pseudorandom) |
| 47 | | . . Plural generators |
| 28 | | PARTICULAR ALGORITHMIC FUNCTION ENCODING |
| 29 | | . NBS/DES algorithm |
| 30 | | . Public key |
| 287 | | ELECTRIC SIGNAL MODIFICATION |
| 22 | | . Having magnetic record carrier (e.g., tape, drum) |
| 26 | | . Having mechanical control of signal encryption (e.g., cam) |
| 27 | | . . By perforated record |
| 51 | | . Having production of printed copy (e.g., printer, typewriter) |
| 52 | | . Including particular structure or housing (e.g., display, keyboard) |
| 53 | | . . Audio transducer mounting or structure |
| 54 | | BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY) |
| 55 | | HAVING PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER) |
| 56 | | SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS |
| 57 | | . Rotatable |
| 58 | | . . Characters on peripheral surface (e.g., cylinder section) |
| 59 | | MISCELLANEOUS |
| | | ********************************* |
| | | FOREIGN ART COLLECTIONS |
| | | ********************************* |
| | | Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collection listed below. These collections contain ONLY foreign patents or nonpatent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived. |
| FOR 103 | | STORED INFORMATION ACCESS OR COPY PREVENTION (380/3) |
| FOR 104 | | . Digital data (e.g., software program protection, data encryption) (380/4) |
| FOR 105 | | . Video (380/5) |
| FOR 106 | | ELECTRIC SIGNAL MASKING (380/6) |
| FOR 107 | | . Video (380/7) |
| FOR 108 | | . By signal having discrete step amplitude variation (380/8) |
| FOR 109 | | ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) (380/9) |
| FOR 110 | | . Video (380/10) |
| FOR 111 | | . . Variable time delay modulation of baseband video signal (380/11) |
| FOR 112 | | . . Carrier phase shift (380/12) |
| FOR 113 | | . . Carrier frequency conversion (380/13) |
| FOR 114 | | . . Nonstandard scan of video information (380/14) |
| FOR 115 | | . . By modifying synchronizing signal (380/15) |
| FOR 116 | | . . Record or coin controlled (380/16) |
| FOR 117 | | . . Phase inversion of scan line information (380/17) |
| FOR 118 | | . . Facsimile (380/18) |
| FOR 119 | | . . Encrypting of accompanying audio signal (380/19) |
| FOR 120 | | . . Control coding (380/20) |
| FOR 121 | | . Having transmission or distribution of key signal (380/21) |
| FOR 148 | | . Having particular synchronization or initiation (380/48) |
| FOR 149 | | . Having digital signal handling (e.g., digital control, digital computer communication) (380/49) |
| FOR 150 | | . . Including shift register or memory (380/50) |
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