| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an information disclosure system for prohibiting electronic data from being referred to until a predetermined expiration date, and permitting it after that, when the electronic data includes information that is to be concealed until the expiration date, and disclosed thereafter. <P>SOLUTION: The information disclosure system includes: a computer system of an operator 100 having a user management part 120 that provides a user 300 with a plurality of public keys, and a key group management part 110 for storing each public keys together with information about the expiration date; and a plurality of terminals of key holders 200 each having a key management part 220 storing a private key until the expiration date arrives. The private keys are stored in the different key holders 200 in a distributed manner. The key group management part 110 manages information about the key holder 200 for storing the private key corresponding to each public key, receives the private key from each key holder 200 after the arrival of the expiration date, and discloses the encrypted electronic data 320 to a person 400 who refers to the electronic data 320 when all the private keys are obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
