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Class Information
Number: 380/252
Name: Cryptography > Electric signal masking
Description: Subject matter wherein the characteristics of an information bearing electric signal are obscured by the addition of an extraneous interfering signal.

Sub-classes under this class:

Class Number Class Name Patents
380/253 By signal having discrete frequency component 50
380/254 By signal having discrete step amplitude variation 31

Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8711688 Traffic flow analysis mitigation using a cover signal Apr. 29, 2014
8649552 Data obfuscation of text data using entity detection and replacement Feb. 11, 2014
8645705 Information processing device and activation control method Feb. 4, 2014
8638944 Security countermeasures for power analysis attacks Jan. 28, 2014
8619984 Differential privacy preserving recommendation Dec. 31, 2013
8619985 Table splitting for cryptographic processes Dec. 31, 2013
8612346 Method and system for closed loop collect on delivery (C.O.D.) payments Dec. 17, 2013
8600055 Method and system using stealth noise modulation Dec. 3, 2013
8588426 Methods and apparatus to secure communications in a mobile network Nov. 19, 2013
8582764 Device and method for concealing customer information from a customer service representative Nov. 12, 2013
8582765 Masking of data in a calculation Nov. 12, 2013
8577034 Method and device for protecting a reading device for card-shaped data carriers from unauthorized evaluation or copying of magnetically encoded data of an inserted card-shaped data carrier Nov. 5, 2013
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
8553877 Substitution table masking for cryptographic processes Oct. 8, 2013
8542831 Multiple transform utilization and application for secure digital watermarking Sep. 24, 2013
8538886 Watermarking system and methodology for digital multimedia content Sep. 17, 2013
8488781 Method for implementing symmetric key encryption algorithm against power analysis attacks Jul. 16, 2013
8462949 Method and apparatus for secure display of visual content Jun. 11, 2013
8423759 Method of bootstrapping an authenticated data session configuration Apr. 16, 2013
8406459 Method and apparatus to mark a document using a combination between guilloches and watermarking, method and apparatus to read previous combination Mar. 26, 2013
8385547 Method and apparatus for secure digital communications using chaotic signals Feb. 26, 2013
8355505 Picture taking apparatus and method of controlling same Jan. 15, 2013
8355514 Audio encoding to convey auxiliary information, and media embodying same Jan. 15, 2013
8325928 Security countermeasure for power analysis attacks Dec. 4, 2012
8315385 Digital entroping for digital audio reproductions Nov. 20, 2012
8315388 System and method of decoupling and exposing computing device originated location information Nov. 20, 2012
8300813 Secure information transfer based on global position Oct. 30, 2012
8300820 Method of embedding a digital watermark in a useful signal Oct. 30, 2012
8290145 Transition between masked representations of a value during cryptographic calculations Oct. 16, 2012
8271799 System and method for generating a disguised password based on a real password Sep. 18, 2012
8265273 Encryption device using mask value to convert plain text into encrypted text Sep. 11, 2012
8265278 System and methods for permitting open access to data objects and for securing data within the data objects Sep. 11, 2012
8266709 Adjustable resolution media format Sep. 11, 2012
8254571 Cryptographic system with halting key derivation function capabilities Aug. 28, 2012
8214657 Resistance sensing for defeating microchip exploitation Jul. 3, 2012
8209549 Systems and methods for cryptographic masking of private data Jun. 26, 2012
8209765 Electronic circuit device for cryptographic applications Jun. 26, 2012
8155317 Encryption processing circuit and encryption processing method Apr. 10, 2012
8111731 Block scrambling for orthogonal frequency division multiple access Feb. 7, 2012
8094811 Data encryption device and data encryption method Jan. 10, 2012
8091139 System and method for masking arbitrary Boolean functions Jan. 3, 2012
8074081 Method for replacing contents of a data storage unit Dec. 6, 2011
8036249 System and method of data verification Oct. 11, 2011
8036385 Apparatus and method for applying ciphering in a universal mobile telecommunications system Oct. 11, 2011
8019116 Content processing methods using reversible watermarking Sep. 13, 2011
7986845 Steganographic systems and methods Jul. 26, 2011
7961881 Apparatus and methods for including codes in audio signals Jun. 14, 2011
7958365 Using classification techniques in digital watermarking Jun. 7, 2011
7957977 Media program identification method and apparatus based on audio watermarking Jun. 7, 2011

1 2 3 4 5

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