How Facebook Uses Leaked Passwords to Keep Your Account Safe

There ’s a intellect you ’re not supposed to apply same password for all of your accounts — great - graduated table datum breachers are all too common . But in case you still decline to brook by logic and reasonableness ( and many of us do ) , Facebook now use those stolen - word - made - populace to order you what an half-wit you ’re being . And to keep you dependable .

Basically , Facebook is take on vantage of the fact that hackers will often post their stolen cache of data on sites likePastebinfor all the populace to see . So whenever a stash of usernames and passwords leak from other sites , Facebook goes in , swipes the stolen credential , and checks it against its own user database . Should it find two sets that match , the exploiter will ascertain something likethis alert little notification upon his or her next login :

But do n’t care — this does n’t needs entail that Faceknows what your literal parole is . As the company explained in today ’s blog post :

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This is a entirely automated outgrowth that does n’t postulate us to know or store your actual Facebook password in an unhashed form . In other words , no one here has your plain text password . To check off for matches , we take the electronic mail address and password and run them through the same code that we habituate to check out your password at login time .

Instead of compare two lot of apparent - text passwords and usernames , Facebook is comparing their encrypted similitude . So while that does let them estimate out whether or not user credentials leaked from another site check your own , they still do n’t know what those drug user credentials in reality are .

Of course , you should n’t be using the same word across multiple accounts in the first place . Andtwo - factor assay-mark is almost always the best pre-emptive defenseyou can take . Still , if the worst does pass off , and your password for every account you ’ve had since middle school day does stop up on the big , wide internet , at least it ’s being used for some beneficial .

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