MD5 checksum is a number used to verify integrity of files. Let’s say you download a file from the internet and want to make sure it is the same as the one you intended to download (i.e. there was no man-in-the-middle attack or integrity corruption during data transfer).
Easy way to check this number in Windows:
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download Nero MD5 Verifier from http://www.nero.com/enu/tools-utilities.html
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copy paste the number from the issuer,
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browse for the file to be checked.
If the number in ‘Step 1′ appears green the MD5 checksum of the two files is identical. In other words, the downloaded file was probably not tampered with and you’re good to go.
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