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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)

488
380/247

Cellular telephone cryptographic authentication

625
380/249

Initialization

150
380/250

Usage pattern detection

115
380/248

Visiting center

136
380/255

Communication system using cryptography

895
380/257

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

138
380/41

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

44
380/267

Correcting for random appearance of control character code

39
380/42

Data stream/substitution enciphering

415
380/43

Key sequence signal combined with data signal

381
380/256

Fiber optic network

243
380/38

Frequency shift or inversion

78
380/39

Having plural band pass filters

32
380/269

Having compression

165
380/40

Having plural band pass filters

35
380/258

Position dependent or authenticating

266
380/268

Pseudo-random sequence scrambling

356
380/275

Speech scrambler detail

92
380/276

Including sampling

59
380/259

Symmetric key cryptography

488
380/265

Combining outputs of shift register

122
380/266

Including a modem

73
380/264

Key derived from addressable memory element

171
380/260

Symmetric key synchronization

253
380/261

Including frame synchronization

133
380/263

Nonlinear or chaotic system

168
380/262

Transmitting a seed, sequence, or initial value

397
380/36

Time segment interchange

84
380/37

Block/data stream enciphering

667
380/35

Variable time delay modulation

66
380/270

Wireless communication

1103
380/271

Having receiver selection (e.g., pager)

97
380/272

Including hand-off based cryptographic alteration

94
380/31

Plural modulation of single carrier

58
380/32

Wobbling of carrier

11
380/273

Rekeying system

228
380/274

Synchronization

170
380/33

Using plural paths or channels

183
380/34

Plural carrier frequencies

460
380/1

Cryptanalysis

109
380/252

Electric signal masking

191
380/253

By signal having discrete frequency component

42
380/254

By signal having discrete step amplitude variation

29
380/287

Electric signal modification

135
380/22

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

85
380/26

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

38
380/27

By perforated record

16
380/51

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

414
380/52

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

171
380/53

Audio transducer mounting or structure

13
380/251

Electronic game using cryptography

130
380/2

Equipment test or malfunction indication

172
380/243

Facsimile cryptography

179
380/246

Including generation of an associated coded record

60
380/245

Nonstandard scan pattern

22
380/244

Synchronization

19
380/55

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

223
380/277

Key management

2029
380/44

Having particular key generator

1460
380/45

Multiple key level

422
380/46

Nonlinear (e.g., pseudorandom)

839
380/47

Plural generators

270
380/278

Key distribution

1122
380/279

Key distribution center

527
380/282

By public key method

519
380/280

Control vector or tag

167
380/281

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

493
380/283

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

442
380/285

By public key method

345
380/284

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

314
380/286

Key escrow or recovery

412
380/59

Miscellaneous

249
380/28

Particular algorithmic function encoding

1851
380/29

Nbs/des algorithm

570
380/30

Public key

1538
380/56

Selectively movable element having code characters

35
380/57

Rotatable

19
380/58

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

8
380/200

Video cryptography

579
380/201

Copy protection or prevention

1378
380/203

Having copy protect signal

532
380/202

Having origin or program id

360
380/204

Modifying sync signal

157
380/205

Video electric signal masking

127
380/208

Including filter for removing masking signal

49
380/207

Including locally generated masking signal

47
380/206

Masking of synchronization signal

48
380/209

Masking signal selectively addressed

54
380/210

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

514
380/221

By modifying synchronizing signal

91
380/222

Including phase inversion of scan line information

32
380/224

Including pseudo-synchronizing pulse

38
380/226

Key signal in blanking interval

71
380/223

Key signal on separate carrier

77
380/225

Self-synchronizing circuit at receiver

53
380/220

Carrier frequency conversion

38
380/219

Carrier phase shift

25
380/213

Chrominance scrambling

59
380/239

Encrypted code control signal

452
380/216

Image data converted to digital before modification

134
380/217

Having compression (e.g., mpeg)

277
380/240

Including addressed decoder control signal

218
380/242

Having command signal for receiver

156
380/241

Having program id or authorization

299
380/211

Interactive tv

159
380/236

Modifying accompanying audio signal

92
380/237

Including digital audio

80
380/238

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

62
380/214

Nonstandard scan pattern of video information

52
380/215

Line cut and shuffle

59
380/235

Phase inversion of scan line information

46
380/212

Plural video stream multiplexing

199
380/227

Record or coin controlled

135
380/229

Including authentication

252
380/228

Including key on record

223
380/230

Including usage recording

114
380/231

Usage or charge determination

224
380/232

Including authentication

195
380/234

Including display of supplemental information

65
380/233

Including usage or charge recording at subscriber station

87
380/218

Variable time delay modulation of baseband video signal

56
 
 
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