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NAIST Application NoP04-53



TitleENCRYPTION KEY GENERATION DEVICE
INVENTORKAJI, Yuichi; .
Pub.NoWO/2006/077697Pub Date27.07.2006
International Application NoPCT/JP2005/022617International Application Date 09.12.2005

abstractA scramble key generation unit (26) subjects a predetermined initial encryption key to a unidirectional reverse replacement h1-1 at least once and a trapdoor-equipped unidirectional replacement h2 at least once, thereby generating a plurality of different scramble keys (individual encryption keys) used for encryption and decryption of distributed data. A time key generation unit (28) subjects one of the scramble keys generated by the scramble key generation unit (26) to the unidirectional reverse replacement h1-1 at least once, thereby generating a time key (master encryption key) used for regeneration of a scramble key. Thus, it is possible to effectively and flexibly generate a plurality of individual keys used for encryption and decryption of distributed data and a master encryption key capable of regenerating only some of the individual encryption keys.
National Phase