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Class Information
Number: 380/287
Name: Cryptography > Electric signal modification
Description: Subject matter which makes an information signal unintelligible by varying a parameter of the signal.

Sub-classes under this class:

Class Number Class Name Patents
380/22 Having magnetic record carrier (e.g., tape, drum) 86
380/26 Having mechanical control of signal encryption (e.g., cam) 39
380/51 Having production of printed copy (e.g., printer, typewriter) 425
380/52 Including particular structure or housing (e.g., display, keyboard) 178

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8694799 System and method for protection of content stored in a storage device Apr. 8, 2014
8675879 Methods and devices for allocating scrambling codes Mar. 18, 2014
8676878 Domain managing method, domain extending method and reference point controller electing method Mar. 18, 2014
8640185 Personal-information managing apparatus and personal-information handling apparatus Jan. 28, 2014
8625807 PAPR reduction in multi-carrier-carrier transmission Jan. 7, 2014
8615087 OCDM-based photonic encryption system with provable security Dec. 24, 2013
8601286 Saving and retrieving data based on public key encryption Dec. 3, 2013
8594330 Personalized whitebox descramblers Nov. 26, 2013
8589692 Method and apparatus for verifying CGA signature Nov. 19, 2013
8588426 Methods and apparatus to secure communications in a mobile network Nov. 19, 2013
8582595 Activation of code multiplexing Nov. 12, 2013
8565439 Method for detecting the scrambling of a radiocommunication network, and corresponding storage means and circuit Oct. 22, 2013
8527752 Graduated authentication in an identity management system Sep. 3, 2013
8520852 Method and apparatus for store and replay functions in a digital radio broadcasting receiver Aug. 27, 2013
8488837 Apparatus and method for generating constructively multi-patterned watermark, and apparatus and method for inserting and detecting the watermark using the same Jul. 16, 2013
8478526 Enabling a first mobile device to navigate to a location associated with a second mobile device Jul. 2, 2013
8457919 Process for testing the resistance of an integrated circuit to a side channel analysis Jun. 4, 2013
8452009 Control message processing method May. 28, 2013
8452005 Unicode-compatible encipherment May. 28, 2013
8428266 Method and terminal for implementing hot-plug of smart card Apr. 23, 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
8379861 Integrated circuit and a method for secure testing Feb. 19, 2013
8365243 Image leak prevention using geotagging Jan. 29, 2013
8355505 Picture taking apparatus and method of controlling same Jan. 15, 2013
8331569 Method for generating downlink frame, and method for searching cell Dec. 11, 2012
8331564 Method for generating downlink frame, and method for searching cell Dec. 11, 2012
8320556 Method to allow cryptographic processing of messages without sanitizing the cryptographic processor between messages Nov. 27, 2012
8320566 Method and apparatus for performing constellation scrambling in a multimedia home network Nov. 27, 2012
8320571 Method for generating downlink frame, and method for searching cell Nov. 27, 2012
8315385 Digital entroping for digital audio reproductions Nov. 20, 2012
8300832 System and method for copy protection for digital signals Oct. 30, 2012
8249253 Semiconductor integrated circuit having encrypter/decrypter function for protecting input/output data transmitted on internal bus Aug. 21, 2012
8175276 Encryption apparatus with diverse key retention schemes May. 8, 2012
8091139 System and method for masking arbitrary Boolean functions Jan. 3, 2012
8042175 Digital signal processing apparatus Oct. 18, 2011
8041940 Offloading encryption processing in a storage area network Oct. 18, 2011
7991994 Method for securing an authentication and key agreement protocol Aug. 2, 2011
7987094 Audio encoding to convey auxiliary information, and decoding of same Jul. 26, 2011
7983440 Selection of I-frames for client-side watermarking Jul. 19, 2011
7978852 Method of partially scrambling a data stream Jul. 12, 2011
7974734 Method and system to check an electronic metrological measurement instrument Jul. 5, 2011
7958369 Systems and methods for multiple level control of access of privileges to protected media content Jun. 7, 2011
7932851 Ranging signal structure with hidden acquisition code Apr. 26, 2011
7930537 Architecture for encrypted application installation Apr. 19, 2011
7920713 Recorded video broadcast, streaming, download, and disk distribution with watermarking instructions Apr. 5, 2011
7913299 Systems, methods and computer program products for firewall use of certified binaries Mar. 22, 2011
7890771 Saving and retrieving data based on public key encryption Feb. 15, 2011
7876259 Automatic dependent surveillance system secure ADS-S Jan. 25, 2011
7873183 Embedding and detecting watermarks based on embedded positions in document layout Jan. 18, 2011
7865733 Secure processor and a program for a secure processor Jan. 4, 2011

1 2 3 4

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