windows HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\MachineGuid 是唯一的吗？
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Is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\MachineGuid unique?
提问by John
This pagesays the following:
该页面说明如下：
In the Windows registry is a key called MachineGUID that has a UUID which is created by Windows during installation and should in theory be unique to the machine. In practice this is not the case and I have often come across duplicates of this ID between machines.
在 Windows 注册表中有一个叫做 MachineGUID 的键，它有一个 UUID，它是在安装过程中由 Windows 创建的，理论上应该是机器唯一的。实际上，情况并非如此，我经常在机器之间遇到此 ID 的重复项。
I don't understand why it wouldn't be unique, I mean does Windows uses some weak algorithm to generate this GUID or something?
我不明白为什么它不是唯一的，我的意思是 Windows 是否使用一些弱算法来生成这个 GUID 或其他什么？
回答by Dai
If a machine is restored from a backup or clone (such as in disaster-recovery, lab rollout, or fast VM deployment scenarios) then the MachineGuidvalue would be the same on multiple machines.
如果一台机器从备份或克隆中恢复（例如在灾难恢复、实验室部署或快速 VM 部署场景中），那么MachineGuid多台机器上的值将相同。
I note that the key value itself is read/write, so a post-setup or userland application could overwrite this too, even to a duplicate non-unique value.
我注意到键值本身是读/写的，因此设置后或用户空间应用程序也可以覆盖它，甚至是重复的非唯一值。
