Importance

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Abstract

It is envisaged to relieve the load imposed on the authentication processing as anonymity is maintained to prevent the leakage of the private information, such as taste information of a user. In an information acquisition system 1, a storage server 2 encrypts contents data and other information provided, in their entirety, using a common cipher key for data encryption DEK, and stores the encrypted information as encrypted data EN (DATA). The storage server 2 further encrypts the cipher key for data encryption DEK, as the key information of the encrypted data EN (DEK), using cipher key data KEK, and publicizes the encrypted data EN (DATA), encrypted with the cipher key for encryption DEK, and the encrypted key data EN (DEK), encrypted with the cipher key data KEK. An information processing terminal 3 encrypts the retrieval key word, by the cipher key data KEK, received from the management server 4, and retrieves the encrypted data EN (DATA), stored in the storage server 2, by the encrypted retrieval keyword EN (REF).

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First Claim