| http://www.w3.org/ns/prov#value | - a data encryption step; and a data decryption step, wherein the encryption step comprises the steps of: preparing n number of secret keys and at least one public key in a public-key cryptographic scheme, where n is a positive integer, generating a new key using at least one of the public key, encrypting data in a common-key cryptographic scheme by use of the new key, and storing the encrypted data
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