Research On Key Issues Of Voice Encryption And Transparent Transmission Based On Mobile Communication Networks

Voice communication based on technical support provided by operators has always been an indispensable component in mobile communication networks.With the frequent occurrence of various eavesdropping incidents in recent years,the issue of voice data leakage in mobile devices and mobile communication networks has become a hot topic of discussion.In this context,endto-end encrypted calls have attracted widespread attention.However,due to the transmission rate and channel quality of the mobile communication network voice channel,the time for establishing an encrypted communication link for voice encryption transmission terminals is relatively long,and the quality of voice transmission is poor.To address this problem,this paper is based on end-to-end mobile communication.On the basis of establishing a voice encryption transparent transmission model,a lightweight authentication and key negotiation scheme and a synchronization decryption scheme based on frame ID are designed.The simulation experiment results show that the scheme proposed in this paper can quickly establish an encrypted link,reduce the synchronization decryption problem caused by frame ID transmission errors,and verify its feasibility.This paper regards the mobile communication network and mobile devices as extended voice channels.Without changing the extended voice channels,this paper establishes a voice encryption transparent transmission model by in-depth research on the transmission characteristics of codecs.The process of establishing an encrypted communication link during end-to-end encrypted calls and the problems of decrypting voice frames are analyzed,a voice encryption transmission terminal is designed,and based on this,a voice encryption transparent transmission system is implemented,providing theoretical basis for the transmission of normal data in voice channels and laying a theoretical foundation for subsequent scheme design.To address the problem that the time for establishing an encrypted link for voice encryption transmission in the mobile communication network is relatively long,a lightweight authentication and key negotiation scheme is designed based on certificateless cryptography.The scheme reduces the number of interactions between the two communicating parties,calculation time,and data transmission volume from the perspective of ensuring the security of key negotiation while establishing an e CK security extension model.Security analysis shows that the proposed scheme can resist common known attacks and has low computational and communication costs.To address the problem of incorrect matching of session keys and voice frames causing the entire voice frame to fail decryption,a synchronization decryption scheme based on frame ID is designed.By studying the error characteristics of waveform symbol mapping and combining the requirement that encrypted voice frames do not allow for the addition of too much redundant data,a frame format suitable for extended voice channel transmission is designed.At the same time,a voice frame judgement algorithm and a synchronization decryption mechanism are used to synchronize session keys and voice frames.The simulation experiment shows that this scheme can significantly reduce the frequency of decryption failures under different channel conditions.Based on the above research,a voice encryption transmission terminal is designed and implemented,which includes three parts: encryption/decryption,channel encoding/decoding,waveform mapping/inverse mapping,and forms a voice encryption transparent transmission system with extended voice channels.The voice encryption transmission test was carried out under different SNR conditions,and the simulation experiment results showed that the system can map the encrypted voice data into a pseudo-voice signal and achieve the transparent transmission of encrypted voice signals through extended voice channels.The research results of this paper can provide technical support for end-to-end voice encryption transmission.