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Class Information
Number: 380/38
Name: Cryptography > Communication system using cryptography > Frequency shift or inversion
Description: Subject matter which modifies a segment of the frequency spectrum of the information signal.

Sub-classes under this class:

Class Number Class Name Patents
380/39 Having plural band pass filters 33

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8707053 Performing boolean logic operations using arithmetic operations by code obfuscation Apr. 22, 2014
8671285 Microprocessor that fetches and decrypts encrypted instructions in same time as plain text instructions Mar. 11, 2014
8645714 Branch target address cache for predicting instruction decryption keys in a microprocessor that fetches and decrypts encrypted instructions Feb. 4, 2014
8520843 Method and apparatus for encrypting a discrete signal, and method and apparatus for decrypting Aug. 27, 2013
8442218 Method and apparatus for compound hashing via iteration May. 14, 2013
8331559 Diffused data encryption/decryption processing method Dec. 11, 2012
8300813 Secure information transfer based on global position Oct. 30, 2012
8270708 Method for identifying marked images based at least in part on frequency domain coefficient differences Sep. 18, 2012
8130948 Addressing of groups of broadcast satellite receivers within a portion of the satellite footprint Mar. 6, 2012
7925080 Method for identifying marked images based at least in part on frequency domain coefficient differences Apr. 12, 2011
7870390 Data watermarks created by using an uneven sampling period Jan. 11, 2011
7864959 Methods and apparatus for multi-level dynamic security system Jan. 4, 2011
RE42002 Apparatus and method for high speed data communication Dec. 14, 2010
7844053 Microprocessor apparatus and method for performing block cipher cryptographic functions Nov. 30, 2010
7739501 Cryptographic key construct Jun. 15, 2010
7545929 Analog encryption Jun. 9, 2009
7391867 Graphical display of QKD system statistics Jun. 24, 2008
7379878 Information encoding apparatus and method, information decoding apparatus and method, recording medium utilizing spectral switching for embedding additional information in an audio signal May. 27, 2008
7333608 Analog scrambler Feb. 19, 2008
7298840 Method and system for data integrity protection Nov. 20, 2007
7219082 Financial management system May. 15, 2007
7076659 Enhanced method for digital data hiding Jul. 11, 2006
7051203 Data watermarks created by using an uneven sampling period May. 23, 2006
6993153 Self-orienting watermarks Jan. 31, 2006
6973190 Method for protecting an electronic system with modular exponentiation-based cryptography against attacks by physical analysis Dec. 6, 2005
6973188 Analog scrambler Dec. 6, 2005
6970843 Financial management system Nov. 29, 2005
6823455 Method for robust watermarking of content Nov. 23, 2004
6731757 Multichannel digital signal generation method and apparatus May. 4, 2004
6625297 Self-orienting watermarks Sep. 23, 2003
6501841 Method for providing security for a transmission of information through a plurality of frequency orthogonal subchannels Dec. 31, 2002
6389138 Method and apparatus for generating a complex scrambling code sequence May. 14, 2002
6345100 Robust watermark method and apparatus for digital signals Feb. 5, 2002
6229897 Apparatus and method of secured analog voice communication May. 8, 2001
6078668 Apparatus and method for concealing data bursts in an analog scrambler using audio repetition Jun. 20, 2000
5796838 Method and apparatus for performing frequency spectrum inversion Aug. 18, 1998
5768374 Apparatus and method for continuous scrambling while transmitting or receiving synchronization data Jun. 16, 1998
5757921 Radio communication apparatus having common oscillator applied for PLL, conversion and scramble/descramble circuits May. 26, 1998
5671284 Data encryptor having a scalable clock Sep. 23, 1997
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
5400404 Modulation/demodulation circuit and communication system utilizing the same Mar. 21, 1995
5392354 Cordless phone system capable of scrambling communication signals Feb. 21, 1995
5377223 Notch filtering a spread spectrum signal using fourier series coefficients Dec. 27, 1994
5335279 Digital voice-band spectrum inversion apparatus Aug. 2, 1994
5168522 Wireless telephone with frequency inversion scrambling Dec. 1, 1992
5159631 Audio scrambling system using in-band carrier Oct. 27, 1992
5144666 Decoder to decode an encrypted sound Sep. 1, 1992
5140635 Wireless telephone with frequency inversion scrambling Aug. 18, 1992
5065430 Voice band splitting scrambler Nov. 12, 1991

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