| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an authentication device for guaranteeing the use of a server device for a valid client device, and for making a defense against a DoS (Denial of Service) attack or brute force attacks. <P>SOLUTION: An authentication unit 11 of an SIP (Session Initiation Protocol) server 1 is configured to, when a client device 2 performs access by using HTTP, create an authentication picture having a password presentation area where a onetime password is displayed and a character string input area where a character string is input by the operation of the client device 2, make the client device 2 display the authentication picture, acquire the character string input to the character string input area by the client device 2, register an IP address of the client device 2 when the acquired character string is coincident with the onetime password, and, when the IP address of the client device 2 which has performed access to the SIP server 1 by using SIP afterwards is coincident with the registered IP address, determine the acquired IP address as the authenticated IP address. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
