Group call encrypted transmission method and device of trunking system, trunking terminal and system

Abstract

The invention relates to a group call encryption transmission method and device, a trunking terminal and a system of a trunking system. The transmission method includes: after receiving the group call encryption information sent by the core network, the base station sends a group call message to the trunking terminal; The encryption information is the encryption information generated and cached by the core network during the establishment of a group call session with the calling terminal; the group call encryption information includes the group call key and the superframe number maintained by the base station; the base station receives the group call encryption request returned by the trunking terminal The signaling for requesting group call key information includes the terminal information of the trunking terminal; the base station encrypts the group call encryption information according to the terminal information of the trunking terminal, and generates a group call corresponding to the terminal information of the trunking terminal Key information, and sent to cluster terminals respectively. The invention can dynamically generate the group call key, the key is not easy to be intercepted, has strong anti-destructive ability, and greatly improves the security of the group call key.

Description

technical field [0001] The present invention relates to the field of trunking communication, more specifically, to a group call encryption transmission method and device of a trunking system, a trunking terminal and a system. Background technique [0002] In the existing LTE (Long Term Evolution) security algorithm, the authentication and key negotiation process requires a permanent key for each UE (terminal). For trunking services, users can join different groups and groups can be generated and deleted at any time, so there is no need to Security is also inconvenient to store such permanent keys. For a terminal that accesses later, it is impossible to know the encryption state of the current base station and cannot decrypt it. Therefore, the current standard cannot encrypt the trunking group call. [0003] In the prior art, encryption parameters are issued through plaintext broadcast or encryption using a fixedly stored group key. [0004] At present, there are mainly fou...

AI Technical Summary

Problems solved by technology

[0006] 2) T8-13 Xinwei NAS protocol clarification-end-to-end encryption, this solution is aimed at the single-call calling process, and does not apply to the encrypted scenario of the group call;

[0010] 1. Plaintext broadcast method: the key is easily intercepted and unsafe;

[0011] 2. Fixed storage method: easy to crack by brute force, and difficult to change the key, all terminals need to be collected;

[0012] 3. It is impossible to achieve one-frame-one-encryption

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