You can calculate the checksum of a file, and then compare it with the original checksum of the file to ensure, the file you got is genuine or has not been tampered in any way. I have already covered digital signatures, which can help you know the authenticity of a document, and you can read that here.īut just in case, the sender doesn’t sign the document digitally, there are other recipes to check the authenticity of a document or any digital file you might come across. The same goes for our document files sometimes as well, as there can be many naughty guys, who can tamper the files before it finally reaches us. While such files aren’t critical for our computers, there are some files, like executables, Windows update setup files, which are critical to our computer systems, and if they are tampered in any way, while downloading or in any other way, that can lead to the installer to not work, or can even make our systems start malfunctioning. We all come across hundreds of files every day, either on our personal or our office computers.
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