KEY UPDATE METHOD AND SYSTEM OF SENSOR NODE

摘要

Disclosed are a key update method and system of a sensor node. The method comprises the following steps: a sensor node sending a key update request to a management platform; the management platform authenticating an identity of the sensor node, randomly generating a Ni-bit update key after the authentication is passed, encrypting the update key, and sending encrypted ciphertext information to the sensor node; and the sensor node decrypting the ciphertext information to obtain the update key, and replacing an original key with the update key. The key update method of the present invention shortens the update time, reduces the energy consumption and communication overhead of the node, and improves the network operating efficiency.