This function generates a random string composed of letters a to f, Numbers and hyphens and unnecessarily restricts the key space, resulting in a weakening of the entropy.

该函数生成由字母a至f，数字和连字符组成的随机字符串，并且不必要地限制关键字空间，导致熵的削弱。

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This function generates a random string composed of letters a to f, Numbers and hyphens and unnecessarily restricts the key space, resulting in a weakening of the entropy.

该函数生成由字母a至f，数字和连字符组成的随机字符串，并且不必要地限制关键字空间，导致熵的削弱。

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