One huge problem people face when downloading a Windows 7 ISO from sketchy services is that they have to verify that it was not tampered with. In other words, they need to verify that the Windows 7 they asked for is the Windows 7 they got.
The Windows 7 ISO Verifier has been created by Long Zheng and Sven Groot, and allows users to test to see if the ISO of Windows 7 they have has not been tampered with. ISO images can simply be dropped onto the exe after download.
The program calculates the hash of the local ISO and compare it with an online database, which is constantly updated. The process is very fast. It can obviously happen that a hash is not listed in the online database either because the release is to new, human error or because it has been tampered with (say another language was added).
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