process communication block
... 印刷电路板 (printed circuit board) 过程通信块 (process communication block) 过程控制段 (process control block) ...
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该方法实现简单,但存在缺陷:由于附加块信息不同于正常通信过程,恶意用户容易察觉通信具有密钥恢复功能,使用数据包过滤方法,就可以完全屏蔽密钥恢复功能。
The implementation is practical but with obvious disadvantage: the illegal user can easily notice the key recovery, and by data package filtering, the key recovery function can be screened.
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