2

This page says that Identicons are generated on the basis of hash of the user's IP address.

But, what happens if I change my IP address (for example - log in fro a different machine)?

6

Then you get a different icon.

Unless you provide an email. In which case the icon is based on a hash of your email.

  • icon is based on a hash of your "email", is it? – Lazer Feb 1 '10 at 9:09
  • Yes it is. ---- – Pëkka Feb 1 '10 at 11:17
  • The default is based on your e-mail's hash, but you have the option of setting your own avatar images, and with the help an identicon generator out of many freely available, you can set up your SO's identicon to pretty much any text. --- Trivia: Some very interesting results can be achieved. – XenoRo Nov 1 '12 at 15:17
  • So would it technically be possible to translate the image back to an md5, un-hash the md5, and retrieve a user's email address? – MD XF Dec 2 '16 at 22:06
  • @MDXF - Yes, and it had been done with some success. Look at the comment to the question. The icon's URL already contains the hash, so you don't have to deal with the image at all. – Kobi Dec 3 '16 at 6:54
1

The relationship between identicon/Gravatar and email address was clarified for me in this question.

In particular, how come so many 'different' users had the same identicon?

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