SECURITY MANAGEMENT DEVICE, COMMUNICATION SYSTEM, AND ACCESS CONTROL METHOD

摘要

The present invention provides a technique of preventing a user from being tricked into revealing personal information by pharming. Security server 50 checks whether a combination of a domain name and an IP address of WWW site 30 to be accessed by PC 10 is registered in access-permit DB 55a or access-inhibit DB 55b. Security sever 50 also checks whether the combination is registered in any of secure DNS servers 40 registered in secure DNS DB 55c. On the basis of a result of the checks, security server 50 controls an access by PC 10 to WWW site 30.