Sensor network system based on blockchain and method for generating dynamic link key in the sensor network system

摘要

The present invention relates to a sensor network system based on a block chain having a plurality of nodes. When the slave of the sensor network system receives a key generation request from the master, it detects data on the external environment using a sensor, generates a new dynamic link key using the data and the dynamic link key, and generating a hash-based message authentication code using the pseudo-random number, encrypting the data and the pseudo-random number, and providing an acknowledgment message including the message authentication code, the encrypted data, and the pseudo-random number to the master; The master generates a message authentication code by decrypting the encrypted data and the pseudo-random number of the acknowledgment message received from the critical slave, compares the generated message authentication code with the received message authentication code, and matches each other It is characterized in that a new dynamic link key is generated by using the data and the dynamic link key.