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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在数据加密系统中，通常利用混沌模型迭代产生的序列作为密钥，以保障数据安全，防止非法篡改和窃取。

In the data encryption systems, chaotic sequences can be used as the secret key to guarantee the safety of data and prohibit the juggle and steal unlawfully towards the data we sent.

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这个系统可以让你对机器间互发的数据作加密或扰频处理。

The system lets you encrypt or scramble the data that's sent between machines.

《柯林斯英汉双解大词典》