Patent ID: 8910248
Filing Date: 2014-12-09
Classification: H04L

Abstract:
1. A cryptographic apparatus, comprising: the one or more computers comprising one or more processors configured with: a communication unit configured to send and receive communication data; an authentication processing unit configured to create first information specifying an authenticated terminal device according to a result of web authentication that determines whether or not a connection to a specified network by a terminal device connected to the network relay device is permissible, and manage authentication status of a terminal device indicating whether or not relay of communication data between the terminal device and a node on the specified network by the communication unit is permissible based on the first information and update the authentication status of the terminal device; a Dynamic Host Configuration Protocol (DHCP) snooping processing unit configured to execute snooping of DHCP communication data relayed by the communication unit between the terminal device and a DHCP server, and create second information specifying a layer 3 address allocated to each terminal device based on the DHCP communication data; and a terminal search processing unit configured to specify the terminal device that has already been authenticated based on the first information, specify a layer 3 address allocated to the specified authenticated terminal device based on the second information, and send, via the communication unit, to the specified layer 3 address, confirmation communication data for confirming whether or not the specified authenticated terminal is connected to the specified network, and update the authentication status for the specified authenticated terminal.