Industrial key management and data protection method based on block chain

The invention provides an industrial key management and data protection method based on a block chain, and the method comprises the steps: firstly constructing an industrial information system network model supporting the block chain, then carrying out the configuration of a trusted industrial entity, generating a corresponding public and private key pair, and carrying out the public and private key configuration of a fog server and a cloud server; a trusted industrial entity registers a gateway node and an Internet of Things intelligent device in an information system application program to generate a private key-public key pair, then establishes a secret key between the registered Internet of Things intelligent device and the corresponding gateway node, finally creates a block chain, and uses an operation mechanism of the block chain to protect sensitive data of the Internet of Things intelligent device. Through the key management program, the intelligent equipment supporting the Internet of Things can esta