| 摘要 |
PROBLEM TO BE SOLVED: To improve processing efficiency when encrypting and inputting/outputting confidential data between a recorder and a host device. SOLUTION: Confidential data such as license data are encrypted using the common key encryption algorithm alone which requires smaller computation amount, and is readily realized by hardware means, as compared with the public key encryption algorithm. A license-data transmitter (y) encrypts license data LIC using two keys Kscy and Kssx supplied from a license-data receiver (x). The license data are provided to the license-data receiver in the form of encrypted license data E(Kscy, E(Kssx, LIC)). This enables high-speed processing without deterioration in security even if data access such as recording/readout of data is repeated. COPYRIGHT: (C)2006,JPO&NCIPI
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