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Class Information
Number: 380
Name: Cryptography >
Description: SUBJECT MATTER UNDER THIS CLASS:










Class Number Class Name No. of Patents
380/54

By modifying optical image (e.g., transmissive overlay)

514
380/247

Cellular telephone cryptographic authentication

734
380/249

Initialization

192
380/250

Usage pattern detection

144
380/248

Visiting center

169
380/255

Communication system using cryptography

1061
380/257

Circuit switched network (e.g., wired telephone)

146
380/41

Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)

47
380/267

Correcting for random appearance of control character code

42
380/42

Data stream/substitution enciphering

446
380/43

Key sequence signal combined with data signal

403
380/256

Fiber optic network

274
380/38

Frequency shift or inversion

82
380/39

Having plural band pass filters

33
380/269

Having compression

176
380/40

Having plural band pass filters

40
380/258

Position dependent or authenticating

306
380/268

Pseudo-random sequence scrambling

387
380/275

Speech scrambler detail

99
380/276

Including sampling

60
380/259

Symmetric key cryptography

556
380/265

Combining outputs of shift register

132
380/266

Including a modem

82
380/264

Key derived from addressable memory element

195
380/260

Symmetric key synchronization

278
380/261

Including frame synchronization

140
380/263

Nonlinear or chaotic system

188
380/262

Transmitting a seed, sequence, or initial value

443
380/36

Time segment interchange

88
380/37

Block/data stream enciphering

732
380/35

Variable time delay modulation

69
380/270

Wireless communication

1324
380/271

Having receiver selection (e.g., pager)

99
380/272

Including hand-off based cryptographic alteration

109
380/31

Plural modulation of single carrier

60
380/32

Wobbling of carrier

12
380/273

Rekeying system

254
380/274

Synchronization

182
380/33

Using plural paths or channels

192
380/34

Plural carrier frequencies

463
380/1

Cryptanalysis

124
380/252

Electric signal masking

210
380/253

By signal having discrete frequency component

50
380/254

By signal having discrete step amplitude variation

31
380/287

Electric signal modification

154
380/22

Having magnetic record carrier (e.g., tape, drum)

86
380/26

Having mechanical control of signal encryption (e.g., cam)

39
380/27

By perforated record

19
380/51

Having production of printed copy (e.g., printer, typewriter)

425
380/52

Including particular structure or housing (e.g., display, keyboard)

178
380/53

Audio transducer mounting or structure

14
380/251

Electronic game using cryptography

143
380/2

Equipment test or malfunction indication

182
380/243

Facsimile cryptography

196
380/246

Including generation of an associated coded record

67
380/245

Nonstandard scan pattern

26
380/244

Synchronization

23
380/55

Having production of printed copy (e.g., cryptographic printer or typewriter)

235
380/277

Key management

2367
380/44

Having particular key generator

1724
380/45

Multiple key level

467
380/46

Nonlinear (e.g., pseudorandom)

921
380/47

Plural generators

298
380/278

Key distribution

1332
380/279

Key distribution center

644
380/282

By public key method

586
380/280

Control vector or tag

189
380/281

Using master key (e.g., key-encrypting-key)

568
380/283

User-to-user key distributed over data link (i.e., no center)

488
380/285

By public key method

382
380/284

Using master key (e.g., key-encrypting-key)

356
380/286

Key escrow or recovery

461
380/59

Miscellaneous

259
380/28

Particular algorithmic function encoding

2135
380/29

Nbs/des algorithm

635
380/30

Public key

1676
380/56

Selectively movable element having code characters

38
380/57

Rotatable

20
380/58

Characters on peripheral surface (e.g., cylinder section)

9
380/200

Video cryptography

650
380/201

Copy protection or prevention

1489
380/203

Having copy protect signal

561
380/202

Having origin or program id

384
380/204

Modifying sync signal

166
380/205

Video electric signal masking

137
380/208

Including filter for removing masking signal

51
380/207

Including locally generated masking signal

50
380/206

Masking of synchronization signal

53
380/209

Masking signal selectively addressed

55
380/210

Video electric signal modification (e.g., scrambling)

570
380/221

By modifying synchronizing signal

93
380/222

Including phase inversion of scan line information

33
380/224

Including pseudo-synchronizing pulse

39
380/226

Key signal in blanking interval

74
380/223

Key signal on separate carrier

83
380/225

Self-synchronizing circuit at receiver

58
380/220

Carrier frequency conversion

40
380/219

Carrier phase shift

26
380/213

Chrominance scrambling

59
380/239

Encrypted code control signal

483
380/216

Image data converted to digital before modification

138
380/217

Having compression (e.g., mpeg)

299
380/240

Including addressed decoder control signal

230
380/242

Having command signal for receiver

170
380/241

Having program id or authorization

315
380/211

Interactive tv

173
380/236

Modifying accompanying audio signal

95
380/237

Including digital audio

82
380/238

Including frequency modification of audio signal or frequency shifting of audio carrier

63
380/214

Nonstandard scan pattern of video information

55
380/215

Line cut and shuffle

59
380/235

Phase inversion of scan line information

46
380/212

Plural video stream multiplexing

212
380/227

Record or coin controlled

145
380/229

Including authentication

284
380/228

Including key on record

237
380/230

Including usage recording

116
380/231

Usage or charge determination

238
380/232

Including authentication

210
380/234

Including display of supplemental information

70
380/233

Including usage or charge recording at subscriber station

92
380/218

Variable time delay modulation of baseband video signal

58
 
 
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