| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve an anonymous negotiation between users so as to satisfy the requirements of security of identification under anonymity, traceability, non-association, and partial non-association. <P>SOLUTION: User devices 20A and 20B generate a self negotiation public key and a self negotiation secret key for each negotiation ID, and add a group sign to the self negotiation public key and the negotiation ID to be shared. The user devices 20A and 20B encrypt, based on a negotiating partner negotiation public key, a message with a digital sign which is formed by adding the digital sign to a new message based on the self negotiation secret key, and write the obtained encrypted message with the digital sign in a negotiation content storage portion 15 of an anonymous negotiation management device 10. The user devices 20B and 20A decrypt, based on the self negotiation secret key, the encrypted message with the digital sign browsed from the anonymous negotiation management device 10, verify, based on the negotiation partner negotiation public key, the digital sign of the obtained message with the digital sign, and receive the message when it is authorized. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
