Multicast method based on key dynamic negotiation and related device

Abstract

The invention discloses a multicast method based on key dynamic negotiation and a related device. The method comprises the following steps: allocating a parameter subset to each receiving node; determining a target receiving node in each receiving node, selecting a parameter corresponding to the target receiving node from the parameter set to generate a sending set, and obtaining a receiving set according to the sending set, wherein the receiving set and the sending set to complement each other in the parameter set; establishing an intermediate variable and an encryption key according to the parameter sum of the sending set, the parameter sum of the receiving set, the first prime number and the primitive of the first prime number; encrypting the plaintext data through the encryption key toobtain ciphertext data, and sending the ciphertext data, the intermediate variable, the list of the target receiving nodes, the first prime number and the primitive element to a common channel. The problem that key distribution negotiation in multicast communication cannot give consideration to the balance between the number of distributed keys and the encryption amount and the communication amount is solved, and the balance among the number of keys/parameters, the encryption calculation amount and the data communication amount and on-demand dynamic negotiation of the keys are achieved.

Description

technical field [0001] This application relates to the field of communication technology, in particular to a multicast method and related devices based on dynamic key negotiation. Background technique [0002] In application scenarios such as wireless sensor networks or the Internet of Things, star or tree network structures are usually used. The gateway node in the network structure manages and controls a large number of sensors or terminals. When the gateway node needs to send the same data to other network nodes, one way is to use unicast to send them one by one, and the other way is to use multicast to send them uniformly . In order to prevent data leakage, it is necessary to encrypt the sent data, which involves the issue of key distribution and negotiation. [0003] Suppose there are n receiving nodes, and the gateway node wants to send the same data to k (1≤k≤n) receiving nodes among them. When the specific receiving node cannot be determined before sending, the fir...

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Problems solved by technology

[0004] The embodiment of the present application provides a multicast method based on dynamic key negotiation and related devices, which are used to solve the problem that the key distribution negotiation in multicast communication cannot take into account the balance between the number of distributed keys, the amount of encryption and the amount of communication, and realizes The balance between the number of keys / parameters, the amount of encrypted calculations, and the amount of data communication, and the on-demand dynamic negotiation of keys

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