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Cryptography > Key Management > Having Particular Key Generator > Multiple Key Level Multiple Key LevelMultiple Key Level patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.08/30/07 - 20070201692 - Data transmission apparatus, data transmission method A data communication apparatus which causes the eavesdropper to take a significantly increased time to analyze a cipher text and provides high concealability is provided. In a modulator section 112a, a branching section 114 branches a lightwave 20 outputted from a light source 113, and outputs respective branched lights to ... 03/22/07 - 20070064936 - Content data delivery method and content data delivery system and handheld device for use therein There is provided a content data delivery system including a playback equipment that is adapted to be able to decrypt a content data encrypted with a content key data and to play back the decrypted content data and that holds an equipment ID to identify itself; a handheld device that ... 02/22/07 - 20070041584 - Method for providing activation key protection A software activation method is disclosed which uses a two-key paradigm. The method provides increased piracy protection while providing a relatively straight forward process for a user to satisfy a license claim. ... 10/26/06 - 20060239453 - Data encryption system for internet communication Two versions of a variable word length encryption method are discussed. The methods are adapted for providing the means for long-term confidential transmission of printed characters, pictures, and voice dialogues over telephone lines or the Internet. ... 02/23/06 - 20060039557 - Data processing method, its program,and its device A management device 20 outputs key designation data read from a card to a SAM unit 9a. The SAM unit 9a uses mutual authentication key data designated by key designation data to generate synthetic key data. The management device 20 and the SAM unit 9a use the synthetic key data ... ### FreshPatents.com Support |