| 摘要 |
PROBLEM TO BE SOLVED: To provide an emergency data restoration system for reading storage data even in emergency when a cryptographic key is lost by storing data encrypted by using the cryptographic key in a storage medium for protecting sensitive information. SOLUTION: A user side data processor 1 for storing encryption data in a connected storage medium 14 and a restoration processor 2 for performing a restoration operation in emergency when the decryption of the encryption data is impossible are configured to restore data by sharing a load and cooperating with each other. The restoration processor 2 prepares a pair of a public key and a personal key, and transfers only the public key to the user side device 2, and the user side device 2 prepares a cryptographic key for encrypting data, and encrypts the cryptographic key by the public key, and writes it in the predetermined part of the storage medium 14. In case of emergency, the user side device 2 extracts the encrypted cryptographic key from the storage medium 14, and transfers it to the restoration processor 1, and the restoration processor 1 returns the cryptographic key decrypted by the personal key to the user side device 2, and the user side device 2 restores the data. COPYRIGHT: (C)2007,JPO&INPIT
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