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Class Information
Number: 380/45
Name: Cryptography > Key management > Having particular key generator > Multiple key level
Description: Subject matter including plural encrypting or decrypting stages each of which has a separate key.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8712045 Digital rights management for media streams Apr. 29, 2014
8712057 Apparatus and method for an iterative cryptographic block Apr. 29, 2014
8712044 Key management system Apr. 29, 2014
8693682 Data encryption Apr. 8, 2014
8687813 Methods circuits devices and systems for provisioning of cryptographic data to one or more electronic devices Apr. 1, 2014
8683224 Processor-implemented method for ensuring software integrity Mar. 25, 2014
8683225 Microprocessor that facilitates task switching between encrypted and unencrypted programs Mar. 25, 2014
8666079 Decoding and encoding data Mar. 4, 2014
8660268 Keyed pseudo-random number generator Feb. 25, 2014
8656166 Storage and authentication of data transactions Feb. 18, 2014
8656179 Using hidden secrets and token devices to create secure volumes Feb. 18, 2014
8638935 System and method for key space division and sub-key derivation for mixed media digital rights management content Jan. 28, 2014
8640210 Distributed computer systems with time-dependent credentials Jan. 28, 2014
8630416 Wireless device and method for rekeying with reduced packet loss for high-throughput wireless communications Jan. 14, 2014
8625787 Hierarchical key management for secure communications in multimedia communication system Jan. 7, 2014
8600052 Key generation device, encryption device, reception device, key generation method, key processing method, and program Dec. 3, 2013
8588411 Method for secure communication in a network, a communication device, a network and a computer program therefor Nov. 19, 2013
8582763 Method and apparatus for decoding broadband data Nov. 12, 2013
8578151 Trust-management systems and methods Nov. 5, 2013
8571211 Method and apparatus for generating security key in a mobile communication system Oct. 29, 2013
8571210 Content protection apparatus and method using binding of additional information to encryption key Oct. 29, 2013
8565422 Method and system for enryption key versioning and key rotation in a multi-tenant environment Oct. 22, 2013
8565436 Secure self managed data (SSMD) Oct. 22, 2013
8566603 Managing security operating modes Oct. 22, 2013
8553878 Data transformation system using cyclic groups Oct. 8, 2013
8554222 Method, system and device for maintaining user service continuity Oct. 8, 2013
8548163 Simultaneous scalar multiplication method Oct. 1, 2013
8548171 Pair-wise keying for tunneled virtual private networks Oct. 1, 2013
8543804 Adaptive security policy based scalable video service apparatus and method Sep. 24, 2013
8539234 Secure client-side communication between multiple domains Sep. 17, 2013
8539606 Data protection method and data protection system Sep. 17, 2013
8532288 Selectively isolating processor elements into subsets of processor elements Sep. 10, 2013
8532289 Fast computation of a single coefficient in an inverse polynomial Sep. 10, 2013
8533489 Searchable symmetric encryption with dynamic updating Sep. 10, 2013
8527766 Reducing leakage of information from cryptographic systems Sep. 3, 2013
8522040 Oblivious transfer with access control Aug. 27, 2013
8522028 Method for secure data exchange between two devices Aug. 27, 2013
8509431 Identity management on a wireless device Aug. 13, 2013
8509433 Method and apparatus of generating encryption key for broadcast encryption Aug. 13, 2013
8494155 Method and apparatus of high speed encryption and decryption Jul. 23, 2013
8494168 Locating cryptographic keys stored in a cache Jul. 23, 2013
8489901 Methods and systems for secure encryption of data Jul. 16, 2013
8483394 Secure multi-party communication with quantum key distribution managed by trusted authority Jul. 9, 2013
8473757 Protecting digital data such as images on a device with image acquisition capabilities Jun. 25, 2013
8452007 Security key generating method, device and system May. 28, 2013
8447037 Key tree construction and key distribution method for hierarchical role-based access control May. 21, 2013
8442535 Method, system and device for maintaining user service continuity May. 14, 2013
8422684 Security classes in a media key block Apr. 16, 2013
8407475 Augmented single factor split key asymmetric cryptography-key generation and distributor Mar. 26, 2013
8397083 System and method for efficiently deleting a file from secure storage served by a storage system Mar. 12, 2013

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