基于伪随机序列的DSP程序运行参数加密方法

ENCRYPTING RUNTIME PARAMETERS OF DSP PROGRAM BASED ON PSEUDORANDOM SEQUENCE

提出一种简单的基于伪随机序列的加密方法。在DSP程序运行过程中,将MCU传递给DSP的参数进行加密,使运行参数不会被逻辑分析仪等调试设备破译。该方法在每次通信开始时,由DSP产生伪随机种子应用于加密,使得同一个参数在每次通信中传递的密文不一样。这种方法可以保护外部运行参数较少的DSP程序。

The paper introduces a simple encrypting method based on pseudorandom sequence.When the DSP program is running,it encrypts the parameters transmitted from MCU to DSP,making it impossible to have the parameter values being decrypted by logic analyzer or other equipments.At the beginning of each communication session,a new pseudorandom seed used for encryption is generated by the DSP program,so that the cryptograph transmitted each time in sessions varies even with the same parameter values.This method can protect the DSP programs with few external runtime parameters.