A trunking communication off-network direct voice group call transmission encryption method and device

Abstract

The invention relates to a trunking communication system, in particular to a trunking communication off-network direct voice group call transmission encryption method and device. The speaker encryption module of the present invention obtains the corresponding DMO key to encrypt the speaker session key according to the current time, and obtains the corresponding ciphertext; the speaker communication terminal repeatedly sends the voice data carrying the ciphertext T times, and the xth listening party communication terminal pairs The voice data of the T frame bearing ciphertext is processed to obtain the ciphertext; then, through the analysis of the DMO root key of the xth listener's cryptographic module, the xth listener's session identical to the speaker's session key is obtained Key; starting from frame T+1, the cryptographic module of the xth listener adopts the same symmetric encryption and decryption algorithm as that of the speaker, and the xth session key and the initial vector of the xth listener are sent by the communication terminal of the speaker The encrypted voice frame data is decrypted; therefore, the voice data sent by the speaker communication terminal is received and played by the xth listener communication terminal.

Description

technical field [0001] The invention relates to a trunking communication system, in particular to a trunking communication off-network direct voice group call transmission encryption method and device. Background technique [0002] The trunking mobile communication system is an advanced mobile command and dispatch system, which plays a huge role in enterprises, public institutions, public security, military, oil fields, airports and other departments that require high command and dispatch functions. Compared with the public mobile communication system, the digital trunking communication system has the characteristics of fast call connection, high safety and reliability, and high resource utilization rate, and is especially suitable for mobile users to engage in production scheduling and command and control services. [0003] The off-network direct mode is an important feature in the trunking mobile communication system. The off-network direct mode technology refers to an opt...

AI Technical Summary

Problems solved by technology

The DMO voice communication of the general trunking system is not encrypted, and there is a risk of being eavesdropped, but the communication information of users such as the military and public institutions is relatively sensitive, and there is a strong demand for encrypted communication; DMO communication is a direct communication between terminals. When encrypting, it is not possible to distribute the key centrally through the central password management device, and it can only be directly distributed end-to-end

By querying the existing public research papers, patents, and related products of mobile communication voice encryption communication technology, there is no systematic way to propose a safe, reliable, and practical DMO key distribution and voice encryption. Therefore, a secure There is a practical necessity for a reliable and practical implementation of DMO group call encryption

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