APPLICATION LIST|ARCHIVED APPLICATIONS|US PATENT CLASSIFICATIONS

CRYPTOGRAPHY

Sub-classifications for 380
ClassificationsCodeApplicationsSubscribe
 
CRYPTANALYSIS380/0010000
 
EQUIPMENT TEST OR MALFUNCTION INDICATION380/0020000
 
VIDEO CRYPTOGRAPHY380/2000000
 
Copy protection or prevention380/2010000
 
Having origin or program ID380/2020000
 
Having copy protect signal380/2030000
 
Modifying sync signal380/2040000
 
Video electric signal masking380/2050000
 
Masking of synchronization signal380/2060000
 
Including locally generated masking signal380/2070000
 
Including filter for removing masking signal380/2080000
 
Masking signal selectively addressed380/2090000
 
Video electric signal modification (e.g., scrambling)380/2100000
 
Interactive TV380/2110000
 
Plural video stream multiplexing380/2120000
 
Chrominance scrambling380/2130000
 
Nonstandard scan pattern of video information380/2140000
 
Line cut and shuffle380/2150000
 
Image data converted to digital before modification380/2160000
 
Having compression (e.g., MPEG)380/2170000
 
Variable time delay modulation of baseband video signal380/2180000
 
Carrier phase shift380/2190000
 
Carrier frequency conversion380/2200000
 
By modifying synchronizing signal380/2210000
 
Including phase inversion of scan line information380/2220000
 
Key signal on separate carrier380/2230000
 
Including pseudo-synchronizing pulse380/2240000
 
Self-synchronizing circuit at receiver380/2250000
 
Key signal in blanking interval380/2260000
 
Record or coin controlled380/2270000
 
Including key on record380/2280000
 
Including authentication380/2290000
 
Including usage recording380/2300000
 
Usage or charge determination380/2310000
 
Including authentication380/2320000
 
Including usage or charge recording at subscriber station380/2330000
 
Including display of supplemental information380/2340000
 
Phase inversion of scan line information380/2350000
 
Modifying accompanying audio signal380/2360000
 
Including digital audio380/2370000
 
Including frequency modification of audio signal or frequency shifting of audio carrier380/2380000
 
Encrypted code control signal380/2390000
 
Including addressed decoder control signal380/2400000
 
Having program ID or authorization380/2410000
 
Having command signal for receiver380/2420000
 
FACSIMILE CRYPTOGRAPHY380/2430000
 
Synchronization380/2440000
 
Nonstandard scan pattern380/2450000
 
Including generation of an associated coded record380/2460000
 
CELLULAR TELEPHONE CRYPTOGRAPHIC AUTHENTICATION380/2470000
 
Visiting center380/2480000
 
Initialization380/2490000
 
Usage pattern detection380/2500000
 
ELECTRONIC GAME USING CRYPTOGRAPHY380/2510000
 
ELECTRIC SIGNAL MASKING380/2520000
 
By signal having discrete frequency component380/2530000
 
By signal having discrete step amplitude variation380/2540000
 
COMMUNICATION SYSTEM USING CRYPTOGRAPHY380/2550000
 
Fiber optic network380/2560000
 
Circuit switched network (e.g., wired telephone)380/2570000
 
Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)380/0410000
 
Position dependent or authenticating380/2580000
 
Symmetric key cryptography380/2590000
 
Symmetric key synchronization380/2600000
 
Including frame synchronization380/2610000
 
Transmitting a seed, sequence, or initial value380/2620000
 
Nonlinear or chaotic system380/2630000
 
Key derived from addressable memory element380/2640000
 
Combining outputs of shift register380/2650000
 
Including a modem380/2660000
 
Correcting for random appearance of control character code380/2670000
 
Pseudo-random sequence scrambling380/2680000
 
Having compression380/2690000
 
Wireless communication380/2700000
 
Having receiver selection (e.g., pager)380/2710000
 
Including hand-off based cryptographic alteration380/2720000
 
Rekeying system380/2730000
 
Plural modulation of single carrier380/0310000
 
Wobbling of carrier380/0320000
 
Using plural paths or channels380/0330000
 
Plural carrier frequencies380/0340000
 
Synchronization380/2740000
 
Variable time delay modulation380/0350000
 
Time segment interchange380/0360000
 
Block/data stream enciphering380/0370000
 
Frequency shift or inversion380/0380000
 
Having plural band pass filters380/0390000
 
Having plural band pass filters380/0400000
 
Data stream/substitution enciphering380/0420000
 
Key sequence signal combined with data signal380/0430000
 
Speech scrambler detail380/2750000
 
Including sampling380/2760000
 
KEY MANAGEMENT380/2770000
 
Key distribution380/2780000
 
Key distribution center380/2790000
 
Control vector or tag380/2800000
 
Using master key (e.g., key-encrypting-key)380/2810000
 
By public key method380/2820000
 
User-to-user key distributed over data link (i.e., no center)380/2830000
 
Using master key (e.g., key-encrypting-key)380/2840000
 
By public key method380/2850000
 
Key escrow or recovery380/2860000
 
Having particular key generator380/0440000
 
Multiple key level380/0450000
 
Nonlinear (e.g., pseudorandom)380/0460000
 
Plural generators380/0470000
 
PARTICULAR ALGORITHMIC FUNCTION ENCODING380/0280000
 
NBS/DES algorithm380/0290000
 
Public key380/0300001
 
ELECTRIC SIGNAL MODIFICATION380/2870000
 
Having magnetic record carrier (e.g., tape, drum)380/0220000
 
Having mechanical control of signal encryption (e.g., cam)380/0260000
 
By perforated record380/0270000
 
Having production of printed copy (e.g., printer, typewriter)380/0510000
 
Including particular structure or housing (e.g., display, keyboard)380/0520000
 
Audio transducer mounting or structure380/0530000
 
BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY)380/0540000
 
HAVING PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER)380/0550000
 
SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS380/0560000
 
Rotatable380/0570000
 
Characters on peripheral surface (e.g., cylinder section)380/0580000
 
MISCELLANEOUS380/0590000
 
FOREIGN ART COLLECTIONS3800
 
CLASS-RELATED FOREIGN DOCUMENTS380/FOR0000
 
STORED INFORMATION ACCESS OR COPY PREVENTION (380/3)380/FOR1030
 
Digital data (e.g., software program protection, data encryption) (380/4)380/FOR1040
 
Video (380/5)380/FOR1050
 
ELECTRIC SIGNAL MASKING (380/6)380/FOR1060
 
Video (380/7)380/FOR1070
 
By signal having discrete step amplitude variation (380/8)380/FOR1080
 
ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) (380/9)380/FOR1090
 
Video (380/10)380/FOR1100
 
Variable time delay modulation of baseband video signal (380/11)380/FOR1110
 
Carrier phase shift (380/12)380/FOR1120
 
Carrier frequency conversion (380/13)380/FOR1130
 
Nonstandard scan of video information (380/14)380/FOR1140
 
By modifying synchronizing signal (380/15)380/FOR1150
 
Record or coin controlled (380/16)380/FOR1160
 
Phase inversion of scan line information (380/17)380/FOR1170
 
Facsimile (380/18)380/FOR1180
 
Encrypting of accompanying audio signal (380/19)380/FOR1190
 
Control coding (380/20)380/FOR1200
 
Having transmission or distribution of key signal (380/21)380/FOR1210
 
Having particular synchronization or initiation (380/48)380/FOR1480
 
Having digital signal handling (e.g., digital control, digital computer communication) (380/49)380/FOR1490
 
Including shift register or memory (380/50)380/FOR1500