| http://www.w3.org/ns/prov#value | - In FIG. 13, when an OPEN message is received via the network interface 350, the client communication unit 340 extracts a node ID and authentication information from the message and analyzes their contents (step 2510) and checks to see if the message is a message that was sent from a legitimate communication node 120 installed in the network (step 2515).
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