Recently doing a project, you need to install the operating system, Redhat, but in the redhat official website to download it is strenuous, slow do not say, it is important to download the final event of termination of the download will appear, it is really a headache, so looking at whether the country has the same ISO image, but need to verify the security of the ISO, or if the virus is implanted *** or mirror, that after the installation would not worship -
the most direct and effective way is to compare ISO image as to whether the hash value provided by the official website, then how does it work? Here's a brief look.
General official website will provide an ISO image of the hash values are as follows: 
the back we have to do is to get the hash value of your downloaded ISO image, and do the above comparison is OK, if the same is download the source from the official website, if different, the caution, unless you know what changed.
So how to get the hash value of the ISO it? In fact, windows operating system comes with a command to get iso image, that is certutil. Details are as follows:
Run as Administrator cmd:
Note: The path is already absolute path. It can check multiple file encryption algorithms MD5, SHA1, SHA256 and so on.
Then these two strings do is to do comparison, over the same comparison of my mirror and official website, you can rest assured that use, if different, it would have to pay attention! ! !
I hope you can help, thank you ~
Reference documents: https://www.jianshu.com/p/6384e7f42175