Data transmission method, device and system thereof

Abstract

The invention discloses a data transmission method, a device and a system thereof, wherein the data transmission method for a node comprises the steps of: generating a first cryptograph through a communication request of a first secret key encryption node and a private key generator, wherein the first secret key is a symmetrical secret key which is distributed by a secret key distribution center to the node; transmitting the first cryptograph to the secret key distribution center; receiving and using the first secret key for decrypting a second cryptograph which returns from the secret key distribution center, obtaining the secret key of a session at this time and a third cryptograph; forwarding the third cryptograph to the private key generator; and receiving and using the secret key of the session at this time for decrypting a fourth cryptograph which is transmitted by the private key generator and is encrypted by the secret key at this time, and obtaining a public parameter and the private key. According to the data transmission method, the node uses the secret key distribution center for communicating with the private key generator through one-time session keys which are distributed according to different symmetrical keys as nodes, thereby effectively preventing impersonation attacks to the node, and simultaneously ensuring high safety in distributing a public parameter and a private key of the node by a private key server.

Description

technical field [0001] The present invention relates to the security field of the Internet of Things, in particular to a data transmission method, device and system. Background technique [0002] The Internet of things (IoT) is to connect items with the Internet through radio frequency identification and other information sensing devices to realize intelligent identification and management. The core and foundation of the Internet of Things is still the Internet, which is an extended and expanded network based on the Internet. Its client end extends and extends to any item and item for information exchange and communication. The Internet of Things is mainly composed of a large number of wireless sensor nodes, wireless sensor networks and the Internet. Both the sensor nodes and the sensor network itself have certain resource limitations, which will directly affect the security mechanism of the Internet of Things. [0003] In all security solutions, authenticated encryption t...

AI Technical Summary

Problems solved by technology

But its obvious disadvantage is that there must be a key pre-distribution process, that is, the symmetric key is stored in the node in advance, which is not flexible enough for adding and replacing nodes.

The disadvantage of using the symmetric key system in the WSN of the Internet of Things is that the ability to resist man-in-the-middle attacks is very limited, it does not support identity authentication of neighbor nodes, and it cannot resist impersonation attacks. With the increase of captured nodes, more key information will be exposed

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