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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)

392
380/247

Cellular telephone cryptographic authentication

350
380/249

Initialization

78
380/250

Usage pattern detection

52
380/248

Visiting center

74
380/255

Communication system using cryptography

440
380/257

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

107
380/41

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

41
380/267

Correcting for random appearance of control character code

31
380/42

Data stream/substitution enciphering

289
380/43

Key sequence signal combined with data signal

306
380/256

Fiber optic network

140
380/38

Frequency shift or inversion

67
380/39

Having plural band pass filters

30
380/269

Having compression

123
380/40

Having plural band pass filters

29
380/258

Position dependent or authenticating

166
380/268

Pseudo-random sequence scrambling

253
380/275

Speech scrambler detail

81
380/276

Including sampling

53
380/259

Symmetric key cryptography

269
380/265

Combining outputs of shift register

94
380/266

Including a modem

67
380/264

Key derived from addressable memory element

109
380/260

Symmetric key synchronization

154
380/261

Including frame synchronization

100
380/263

Nonlinear or chaotic system

99
380/262

Transmitting a seed, sequence, or initial value

294
380/36

Time segment interchange

70
380/37

Block/data stream enciphering

437
380/35

Variable time delay modulation

52
380/270

Wireless communication

613
380/271

Having receiver selection (e.g., pager)

80
380/272

Including hand-off based cryptographic alteration

49
380/31

Plural modulation of single carrier

43
380/32

Wobbling of carrier

10
380/273

Rekeying system

148
380/274

Synchronization

127
380/33

Using plural paths or channels

143
380/34

Plural carrier frequencies

437
380/1

Cryptanalysis

72
380/252

Electric signal masking

141
380/253

By signal having discrete frequency component

35
380/254

By signal having discrete step amplitude variation

25
380/287

Electric signal modification

91
380/22

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

71
380/26

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

27
380/27

By perforated record

9
380/51

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

325
380/52

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

153
380/53

Audio transducer mounting or structure

10
380/251

Electronic game using cryptography

78
380/2

Equipment test or malfunction indication

137
380/243

Facsimile cryptography

136
380/246

Including generation of an associated coded record

46
380/245

Nonstandard scan pattern

12
380/244

Synchronization

9
380/55

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

160
380/277

Key management

1054
380/44

Having particular key generator

778
380/45

Multiple key level

275
380/46

Nonlinear (e.g., pseudorandom)

655
380/47

Plural generators

200
380/278

Key distribution

544
380/279

Key distribution center

275
380/282

By public key method

333
380/280

Control vector or tag

95
380/281

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

320
380/283

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

292
380/285

By public key method

231
380/284

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

191
380/286

Key escrow or recovery

252
380/59

Miscellaneous

166
380/28

Particular algorithmic function encoding

1123
380/29

Nbs/des algorithm

375
380/30

Public key

1146
380/56

Selectively movable element having code characters

27
380/57

Rotatable

15
380/58

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

5
380/200

Video cryptography

323
380/201

Copy protection or prevention

856
380/203

Having copy protect signal

373
380/202

Having origin or program id

240
380/204

Modifying sync signal

114
380/205

Video electric signal masking

85
380/208

Including filter for removing masking signal

43
380/207

Including locally generated masking signal

34
380/206

Masking of synchronization signal

41
380/209

Masking signal selectively addressed

44
380/210

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

323
380/221

By modifying synchronizing signal

78
380/222

Including phase inversion of scan line information

30
380/224

Including pseudo-synchronizing pulse

33
380/226

Key signal in blanking interval

62
380/223

Key signal on separate carrier

62
380/225

Self-synchronizing circuit at receiver

41
380/220

Carrier frequency conversion

33
380/219

Carrier phase shift

24
380/213

Chrominance scrambling

54
380/239

Encrypted code control signal

301
380/216

Image data converted to digital before modification

115
380/217

Having compression (e.g., mpeg)

182
380/240

Including addressed decoder control signal

186
380/242

Having command signal for receiver

125
380/241

Having program id or authorization

252
380/211

Interactive tv

109
380/236

Modifying accompanying audio signal

71
380/237

Including digital audio

59
380/238

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

48
380/214

Nonstandard scan pattern of video information

39
380/215

Line cut and shuffle

58
380/235

Phase inversion of scan line information

43
380/212

Plural video stream multiplexing

136
380/227

Record or coin controlled

79
380/229

Including authentication

119
380/228

Including key on record

136
380/230

Including usage recording

68
380/231

Usage or charge determination

154
380/232

Including authentication

129
380/234

Including display of supplemental information

47
380/233

Including usage or charge recording at subscriber station

65
380/218

Variable time delay modulation of baseband video signal

39
 
 
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