介绍了一种基于PIC12CE519单片机的简单有效的数字机顶盒软件加密系统。

This paper introduces a simple and effective PIC12CE519 MCU based software encryption solution of digital set-top box.

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论述了数字加密对讲机的工作原理、系统硬件和软件的实现方法、工作流程，给出了系统的评估方法和评估结果。

This paper expounds the operation principle of the system, implementation of software and hardware, and workflow as well as assessment method and result.

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论文的最后设计了EPP模式的并行通信接口，实现了pc机与FPGA之间数据加密系统的调试验证。

Finally, the parallel interface in EPP mode is designed and the whole data encryption system designing between FPGA and PC is given to carry out the verification of data encryption results.

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