| http://www.w3.org/ns/prov#value | - The encryption step includes the following steps of preparing n pairs of secret keys and public keys in a public-key cryptographic scheme, where n is a positive integer, generating a new key in accordance with at least one of the public keys, encrypting data in a common-key cryptographic scheme by use of the new key, preparing a (k,n) threshold logic (k is an positive integer equal to or less than
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