Clock-Control Sequence Encryption Scheme and Simulation in the PCM/PPK Telemetry System  

作　　者：ZHAO Zemao LIU Jianhao HE Fei 

机构地区：[1]School of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China

出　　处：《China Communications》2010年第4期114-119,共6页中国通信（英文版）

基　　金：supported by the NSAF project No.10776007

摘　　要：PCM/PPK telemetry system is a multi-nary pulse modulation system.It is commonly used to transmit high-accuracy time information and some express signals.To the issue of security that telemetry data is transmitted in the open space,a data encryption scheme in the PCM/PPK telemetry system is proposed.In this scheme,the PCM data of signal source are encrypted by stream cipher in which key streams are generated with clock control LSFR.The scheme can save system resource in the dual-modulation compound telemetry system.A backward key synchronization scheme is also proposed,which has the property of strong real-time and easy to implement.A simplified simulation model of PCM/PPK remote system is established based on the actual framework of telemetry system,and the model is simple and easy to simulate.The error performance of the system is analyzed in theory and tested by computer simulation.Also the security of the system is analyzed.The simulation and analysis results show that the encryption scheme can ensure the security of the telemetry data and does not cause error-diffusion.PCM/PPK telemetry system is a multinary pulse modulation system. It is commonly used to transmit high-accuracy time information and some express signals. To the issue of security that telemetry data is transmitted in the open space, a data encryption scheme in the PCM/PPK telemetry system is proposed. In this scheme, the PCM data of signal source are encrypted by stream cipher in which key streams are generated with clock control LSFR. The scheme can save system resource in the dual-modulation compound telemetry system. A backward key synchronization scheme is also proposed, which has the property of strong real-time and easy to implement. A simplified simulation model of PCM/PPK remote system is established based on the actual framework of telemetry system, and the model is simple and easy to simulate. The error performance of the system is analyzed in theory and tested by computer simulation. Also the security of the system is analyzed. The simulation and analysis results show that the encryption scheme can ensure the security of the telemetry data and does not cause error-diffusion.

关 键 词：TELEMETRY PCM/PPK Stream Cipher Key Stream Generator 

分 类 号：TP873[自动化与计算机技术—检测技术与自动化装置] TP271.31[自动化与计算机技术—控制科学与工程]