Patent ID: 8566587

Claim:
A network system connected with a node having a unique identifier, comprising: a first distribution computing device configured to issue a first key for first key based cryptographic communication, and distribute the first key to the node; a first supply computing device configured to supply the node, using the first key based cryptographic communication, with a function name of the node and a second key corresponding to the unique identifier and associated with the node, the function name being stored at the node after the function name is supplied to the node by the first supply computing device; and a second supply computing device configured to supply the node, in response to the first supply computing device supplying the node with the function name and the second key, with setting information, the setting information enabling second key based cryptographic communication, in response to a request using the function name from the node, wherein the first supply computing device is configured to store the unique identifier and the function name in association with each other, the unique identifier corresponding to an identifier of the node assigned by a vendor of the node, and the function name corresponding to an identifier of the node assigned by a designer of the network system, and the unique identifier and the function name are different from each other.