Apparatus and method for communication using message history-based security key using blockchain

摘要

The present invention relates to a technique for performing encrypted communication over a network or BUS. A communication method using a security key between nodes connected via a network or a BUS comprises the steps of: setting a protection target node among a plurality of nodes; selecting a core message to be shared among the set protection target nodes; and encrypting a message using a key generated so as to be usable for a preset period of time, wherein each of the protection target nodes store the key message to create a block for a preset period of time according to the same key generation rules, and generating and holding a new key based on the generated block and the currently used key, so that information on the previous message and the previous key is sequentially accumulated in the new key.