Digital certificate application method and system, fog node and certificate authority center

Abstract

The present invention provides a digital certificate application method and system, a fog node and a certificate authority center. The method for applying to the fog node includes: sending a traditional certificate request to an external certificate authority center; using a traditional private key to sign a unique identification number when a traditional digital certificate and the traditional private key sent by the external certificate authority center according to the traditional certificate request is received; sending an update certificate request carrying the traditional digital certificate and the signed unique identification number to the external certificate authority center; generating a fog node secret key according to a preset secret key generation rule while a central secretkey sent by the external certificate authority center is received; generating a new public key and a new private key according to the central secret key and the fog node key; sending the new public key, the traditional digital certificate, and the unique identification number to the external certificate authority center so that the external certificate authority center to publish a new digital certificate for the new public key according to the traditional digital certificate and the unique identification number. The scheme can improve the security of fog node communication.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a digital certificate application method, system, fog node and certificate authority center. Background technique [0002] Fog computing is an extended concept of cloud computing. Unlike cloud computing, fog computing is mainly based on small clouds such as personal clouds, private clouds, and enterprise clouds. In this model, data, data processing and applications are concentrated in devices at the edge of the network, rather than being kept almost entirely in the cloud. The edge network devices mainly used by fog can be traditional network devices (routers, switches, gateways, etc. already deployed in the network), or specially deployed local servers. Generally, the fog nodes on the fog computing platform are closer to the bottom layer, communicating directly with users and providing services. Therefore, the security of fog nodes is directly related to the privacy...

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Problems solved by technology

[0004] However, when the user communicates with the fog node, it will use the public key of the fog node to encrypt its own information and send it to the fog node. Since the certificate authority has the private key of the fog node, it can also decrypt the information sent by the user. The security and non-repudiation of fog node communication poses a threat, thus reducing the security of fog node communication

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