How to do an MD5 hash of one's email address? I don't know what MD5 or hash means. What's the definition of MD5, hash?

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    I'm voting to close this question as off-topic because it isn't about a web application. – John C Mar 17 '19 at 22:37

The MD5 hash is something like a fingerprint of the file and serves as an indicator of the overall integrity due to its properties which are:

  • irreversibility - content can't be derived from checksum value alone
  • repeatability - using the same algorithm will always produce the exact same hash value
  • non-discoverability - a single bit difference will result in a completely different hash value
  • hash length - hash value length is determined by algorithm type, not by the file size



In other words: let's say you have a file and you want to make sure that when you send it to someone, it will arrive as an exact copy of your original file. So you will use hash value generator to create a hash value which you will send with the file. The person on the other side will download your file and use a similar generator to verify or to create a hash value for his copy of the file and then compare two hashes (one he created and one you sent him) if they match, and if they do it means that file you sent him wasn't anyhow corrupted in the process of transmission.

Hash values are usually included at the end of the filename enclosed with [] brackets.

  • Ghost.In.The.Shell.2017.2160p.BluRay.x265.10bit.HDR.TrueHD.7.1.Atmos.[FFB68821].mkv
  • Please cite your sources and use blockquotes appropriately. You can flag this for undeletion once you have made the changes. – jonsca Mar 18 '19 at 21:46
  • @user0 thx a lot. how to do 'MD5 hash of one's email address' particularly? – feynman Mar 19 '19 at 1:31
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    @feynman there are various tools and generators such as md5hashgenerator.com or hashitapp.com – user0 Mar 19 '19 at 1:37
  • @user0 can this technique b used for looking up stack exchange users by their email address? – feynman Mar 19 '19 at 5:32
  • @feynman no, that's not possible – user0 Mar 19 '19 at 10:37

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