IoT-based things management system and method using block-chain authentication

An Internet of Things (IoT)-based thing management method using an IoT-based thing management system using block chain authentication wherein unit nodes connect to each other through at least one of wire communication network or wireless communication network, things connect to each other in each of the unit nodes, and control instructions for causing the things to operate are mutually authenticated by the unit nodes so as to confirm the validity of the control instructions, wherein the IoT-based thing management system comprises:

• a plurality of things which connect directly or indirectly to at least one of the wire communication network or the wireless communication network, each of the plurality of things performing individual functions separately, a core which includes an n block chain having n blocks, wherein n is a natural number, the n block chain recording operation histories of the plurality of things, the blocks being linked one after another in the form of a chain, and the core generating unique public keys and unique private keys based on the n block chain and providing the generated keys to each of the things, and a controller which controls operations of the plurality of the things, the method comprising:
• generating, by the core, unique public keys and corresponding private keys based on an n block chain;
• allocating the generated keys to the plurality of things and the controller individually;
• providing a list of the public keys and corresponding private keys to the plurality of things and the controller;
• combining, by the controller, a control instruction with a private key of the controller and a public key of a first thing as a control target to produce a resultant control instruction, the resultant control instruction including an encrypted hash of an effective n-th block that was previously approved and confirmed by the plurality of unit nodes;
• providing the resultant control instruction to the first thing;
• confirming, by the first thing, validity of the control instruction using the private key of the first thing;
• and
• in response to the specific thing determining that the control instruction is valid based on the private key, sending the controller a resultant response signal that includes a response signal from the first thing combined with the private key of the first thing, the resultant response signal sent from the first thing in response to the control instruction and performance of an operation according to the control instruction by the first thing,
• wherein:
• the resultant response signal includes an n+1-th block, or
• the controller computes the n+1-th block based on the resultant response signal, and
• wherein when the n+1-th block includes an n+1-th block hash including an encrypted hash of an effective n-th block that was previously approved and confirmed by a predetermined number of the plurality of unit nodes required to confirm the n+1-th block for generating the public keys and the private keys, wherein at least a part of the unit nodes send, to other unit nodes, an approval confirmation signal for approving the n+1-th block corresponding to the n+1-th block hash, and the approval confirmation signal is generated by each unit node on the basis of the n block chain that each unit node has, and wherein, in the things, the public keys and the private keys are automatically and periodically renewed by adding a renewal data to the n block chain.