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Class Information
Number: 380/254
Name: Cryptography > Electric signal masking > By signal having discrete step amplitude variation
Description: Subject matter wherein the amplitude of the masking signal varies in discrete steps.










Patents under this class:

Patent Number Title Of Patent Date Issued
8571213 Security method for preventing the unauthorized use of multimedia contents Oct. 29, 2013
8559865 Method and apparatus for providing jammer detection in a receiver Oct. 15, 2013
8355514 Audio encoding to convey auxiliary information, and media embodying same Jan. 15, 2013
8300813 Secure information transfer based on global position Oct. 30, 2012
8074081 Method for replacing contents of a data storage unit Dec. 6, 2011
7660418 Cryptographic system and method for geolocking and securing digital information Feb. 9, 2010
7613296 M6 block cipher system and method for encoding content and authenticating a device Nov. 3, 2009
7606388 Contents border detection apparatus, monitoring method, and contents location detection method and program and storage medium therefor Oct. 20, 2009
7599927 Method for searching content particularly for extracts common to two computer files Oct. 6, 2009
7482946 Method and apparatus for camouflaging business-activity information in a telemetry signal Jan. 27, 2009
7482947 Camouflaging business-activity information in a telemetry signal through randomization Jan. 27, 2009
7317796 System and method for video stream encryption Jan. 8, 2008
7003118 High performance IPSEC hardware accelerator for packet classification Feb. 21, 2006
6901514 Secure oblivious watermarking using key-dependent mapping functions May. 31, 2005
6889324 Digital measurement apparatus and image measurement apparatus May. 3, 2005
6330335 Audio steganography Dec. 11, 2001
6175627 Apparatus and method for embedding and extracting information in analog signals using distributed signal features Jan. 16, 2001
5832057 Lockout device for preventing telephone eavesdropping from an extension device, and method Nov. 3, 1998
5613001 Digital signature verification technology for smart credit card and internet applications Mar. 18, 1997
5422919 EMI suppression coding Jun. 6, 1995
5319708 System for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency Jun. 7, 1994
5283807 EMI suppression coding Feb. 1, 1994
5165098 System for protecting digital equipment against remote access Nov. 17, 1992
5029210 Cooperative communication system Jul. 2, 1991
4932057 Parallel transmission to mask data radiation Jun. 5, 1990
4737990 Unauthorized channel jamming signal applying method for CATV system Apr. 12, 1988
4644396 Gate circuit for central control of CATV system Feb. 17, 1987
4636852 Scrambling and descrambling of television signals for subscription TV Jan. 13, 1987
4361729 Narrowband analog message privacy system Nov. 30, 1982
4208545 Secrecy system Jun. 17, 1980
4188580 Secure communication system Feb. 12, 1980











 
 
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