Security Mod Inquiry

[Snoopz326]

I recently saw this mod on a site and was wondering where I can obtain it for my own site for security purposes. Here are the following screen shots of the mod, it's something to do with asking members to put in a memorable word that only they know of in case they lose their password and thus using that memorable word to prove to the administrator that it's their account.

Screen shots of mod:


Thanks