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Class Information
Number: 380/35
Name: Cryptography > Communication system using cryptography > Variable time delay modulation
Description: Subject matter which applies varying amounts of time delay to the information signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7352861 |
Digital electronic component which is protected against electrical-type analyses |
Apr. 1, 2008 |
| 7321660 |
Method and apparatus for encrypting/decrypting data using timed-release keys |
Jan. 22, 2008 |
| 7319712 |
Orthogonal code generation apparatus, scrambling code generation apparatus and portable radio terminal using such apparatus |
Jan. 15, 2008 |
| 7231044 |
Method and apparatus for real-time digital certification of electronic files and transactions using entropy factors |
Jun. 12, 2007 |
| 7218738 |
Encryption and content control in a digital broadcast system |
May. 15, 2007 |
| 7219082 |
Financial management system |
May. 15, 2007 |
| 7177426 |
Electronic file protection using location |
Feb. 13, 2007 |
| 7076064 |
Maintaining end-to-end synchronization on telecommunications connection |
Jul. 11, 2006 |
| 6970843 |
Financial management system |
Nov. 29, 2005 |
| 6970561 |
Encryption and decryption with endurance to cryptanalysis |
Nov. 29, 2005 |
| 6810087 |
Ultra-wideband communications system |
Oct. 26, 2004 |
| 6389138 |
Method and apparatus for generating a complex scrambling code sequence |
May. 14, 2002 |
| 5818934 |
Method and apparatus for providing a cryptographically secure interface between the decryption engine and the system decoder of a digital television receiver |
Oct. 6, 1998 |
| 5805635 |
Secure communication system |
Sep. 8, 1998 |
| RE35078 |
Method and apparatus for encrypting and decrypting time domain signals |
Oct. 31, 1995 |
| 5249199 |
Method and apparatus for reducing spurious noise levels in an audio system |
Sep. 28, 1993 |
| 5235616 |
Bidirectional data transmission system |
Aug. 10, 1993 |
| 5058157 |
Method and apparatus for encrypting and decrypting time domain signals |
Oct. 15, 1991 |
| 5029340 |
CATV terminal unit having an improved descrambling operation |
Jul. 2, 1991 |
| 4953211 |
Encryption apparatus |
Aug. 28, 1990 |
| 4937867 |
Variable time inversion algorithm controlled system for multi-level speech security |
Jun. 26, 1990 |
| 4916736 |
Method and apparatus for encrypting and decrypting time domain signals |
Apr. 10, 1990 |
| 4742546 |
Privacy communication method and privacy communication apparatus employing the same |
May. 3, 1988 |
| 4730340 |
Programmable time invariant coherent spread symbol correlator |
Mar. 8, 1988 |
| 4688251 |
Wave packet communication subsystem for determining the sync pulses and correlating the data pulses of a wave packet |
Aug. 18, 1987 |
| 4649549 |
Apparatus for synchronizing linear PN sequences |
Mar. 10, 1987 |
| 4575754 |
Video scrambler system |
Mar. 11, 1986 |
| 4392021 |
Secure facsimile transmission system using time-delay modulation |
Jul. 5, 1983 |
| 4363130 |
Binary digital communication system |
Dec. 7, 1982 |
| 4324002 |
Delay-modulated random energy intelligence communication system |
Apr. 6, 1982 |
| 4302628 |
Analog signal encrypting and decrypting system |
Nov. 24, 1981 |
| 4247942 |
Jam resistant communication system |
Jan. 27, 1981 |
| 4223182 |
Transmission of signals with privacy |
Sep. 16, 1980 |
| 4221931 |
Time division multiplied speech scrambler |
Sep. 9, 1980 |
| 4211891 |
Method for setting code text generators in ciphering devices |
Jul. 8, 1980 |
| 4195202 |
Voice privacy system with amplitude masking |
Mar. 25, 1980 |
| 4188506 |
Method and installation for masked speech transmission over a telephone channel |
Feb. 12, 1980 |
| 4184117 |
Communication security method and system |
Jan. 15, 1980 |
| 4179657 |
Anti-jamming communication system |
Dec. 18, 1979 |
| 4168395 |
Start/stop teleprinter scrambler |
Sep. 18, 1979 |
| 4160123 |
Methods of and apparatus for the encoded transmission of information |
Jul. 3, 1979 |
| 4125744 |
Communication system |
Nov. 14, 1978 |
| 4099027 |
Speech scrambler |
Jul. 4, 1978 |
| 4068094 |
Method and apparatus for the scrambled transmission of spoken information via a telephony channel |
Jan. 10, 1978 |
| 4064505 |
Signal transmission circuit comprising a coder and a decoder |
Dec. 20, 1977 |
| 4037159 |
Chirp communication system |
Jul. 19, 1977 |
| 4011408 |
Audio transmission protection apparatus |
Mar. 8, 1977 |
| 3988538 |
Digital data scrambler and descrambler |
Oct. 26, 1976 |
| 3970791 |
Voice controlled disappearing audio delay line |
Jul. 20, 1976 |
| 3970790 |
Method and device for the coded transmission of messages |
Jul. 20, 1976 |
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