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Class Information
Number: 380/40
Name: Cryptography > Communication system using cryptography > Having plural band pass filters
Description: Subject matter which divides the signal into a plurality of subbands by filtering prior to further encryption.










Patents under this class:

Patent Number Title Of Patent Date Issued
8601259 Securing data in a dispersed storage network using security sentinel value Dec. 3, 2013
8582759 Method and apparatus for providing content service Nov. 12, 2013
8520843 Method and apparatus for encrypting a discrete signal, and method and apparatus for decrypting Aug. 27, 2013
8503674 Cryptographic key attack mitigation Aug. 6, 2013
8478764 Method and apparatus for concurrent filtering of multiple components of streaming data Jul. 2, 2013
8352374 Article of manufacture for controlling the use of content by providing for the delegation of rendering rights Jan. 8, 2013
8280044 Stream encryption method and encryption system Oct. 2, 2012
8219821 System and method for signature based data container recognition Jul. 10, 2012
8000472 Information encryption apparatus and controlling method of the same, computer program and computer readable storage medium Aug. 16, 2011
7949131 Digital security system May. 24, 2011
7760915 Method, system, and program product for encrypting information Jul. 20, 2010
7545929 Analog encryption Jun. 9, 2009
7310421 Particular plaintext detector Dec. 18, 2007
7277546 Methods and apparatus for multi-level dynamic security system Oct. 2, 2007
7236595 Integrated optics encryption device Jun. 26, 2007
7006634 Hardware-based encryption/decryption employing dual ported key storage Feb. 28, 2006
6898288 Method and system for secure key exchange May. 24, 2005
6823070 Method for key escrow in a communication system and apparatus therefor Nov. 23, 2004
6175639 Digital data encode system Jan. 16, 2001
5995629 Encoding device Nov. 30, 1999
5991416 Scrambling and descrambling circuit for a cordless telephone Nov. 23, 1999
5778073 Method and device for speech encryption and decryption in voice transmission Jul. 7, 1998
5528692 Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset Jun. 18, 1996
5471531 Method and apparatus for low cost audio scrambling and descrambling Nov. 28, 1995
5446795 Universal decoder for television signal scramble systems Aug. 29, 1995
5235640 Master decoder for television signal scramble systems Aug. 10, 1993
5018198 Speech privacy processing method and apparatus therefor May. 21, 1991
5008937 Scrambled-communication system using adaptive transversal filters for descrambling received signals Apr. 16, 1991
4949378 Toy helmet for scrambled communications Aug. 14, 1990
4852166 Analogue scrambling system with dynamic band permutation Jul. 25, 1989
4817141 Confidential communication system Mar. 28, 1989
4723246 Integrated scrambler-encoder using PN sequence generator Feb. 2, 1988
4623918 Pay television system utilizing multi-frequency passive filters Nov. 18, 1986
4519083 Bilateral digital data transmission system May. 21, 1985
4228321 Privacy transmission system with remote key control Oct. 14, 1980
4221931 Time division multiplied speech scrambler Sep. 9, 1980
4206462 Secure communication and ranging system Jun. 3, 1980
4058677 Sound scrambling equipment Nov. 15, 1977
3967067 Secret telephony Jun. 29, 1976
3936749 Matched filter communication systems Feb. 3, 1976











 
 
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