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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:
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Patent Number Title Of Patent Date Issued
8564402 Lock system, unlock device, apparatus, portable terminal device, unlock method, unlock program, and circuit device Oct. 22, 2013
8553879 Content transmission device and content transmission method Oct. 8, 2013
8462951 Method and apparatus for reducing probability of detection, improving jamming resistance and security for broadband wireless systems Jun. 11, 2013
8411632 Transmission protection scheme Apr. 2, 2013
8335314 Adaptive and secure modular connection Dec. 18, 2012
8300813 Secure information transfer based on global position Oct. 30, 2012
8275997 Method of encrypting and transmitting data and system for transmitting encrypted data Sep. 25, 2012
8195954 Smart cards including separate clocks for key processing and non-volatile memory interface communications and methods of operating the same Jun. 5, 2012
8160253 Method, transponder, and system for rapid data transmission Apr. 17, 2012
8036383 Method and apparatus for secure communication between cryptographic systems using real time clock Oct. 11, 2011
7949133 Controlled cryptoperiod timing to reduce decoder processing load May. 24, 2011
7933408 Asynchronous download Apr. 26, 2011
7801297 Communication device and communication control method Sep. 21, 2010
7752453 Method of encrypting and transmitting data and system for transmitting encrypted data Jul. 6, 2010
7672453 Data encryption by nonlinear transfer function Mar. 2, 2010
7665667 System and method for updating access control mechanisms Feb. 23, 2010
7630492 Secure audio stream scramble system Dec. 8, 2009
7613298 System and process for adaptive and progressive scrambling of video streams Nov. 3, 2009
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

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