他不断探索、实验、尝试并检验成效，不停修改、改进，直到它能顺利运行。
He has done it by exploring, by experimenting, by trying it out and seeing whether it works, by gradually changing it and refining it until it does work.
注意，数字签名能检验经过签名的内容是否被修改过。
Note that digital signatures verify whether the signed material has changed at all.
它还可以用来检验新的或修改的安全策略的效果。
It can also be used to verify the effect of a new or changed security policy.
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