Patent ID: 7529926
Filing Date: 2009-05-05
Classification: H04L

Abstract:
1. A server system including a processor connected to a network, comprising: acquisition means for acquiring a temporary IP address of a client; generation means for generating a first public key in accordance with a public parameter such that the first public key is usable corresponding to a first secret key of the client connected to the network, for generating a digital signature based on a second secret key where the second secret key is generated by the server system, and for generating a certificate of the first public key where the certificate of the first public key includes the temporary IP address of the client, a certificate of a second public key, and the digital signature of which legitimacy can be confirmed with the second public key where the second public key is generated by the server system; and sending means for sending the certificate of the first public key generated by said generation means to the temporary IP address of the client, wherein the certificate of the second public key is issued by an authenticating service provider to the server system when the server system submits the second public key to the authenticating service provider.