SHA-512 with salt problem

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hy friend's

i have a problem in SHA_512 algo. how can i differ a user password from another user.
mean's when a user "jon" enter a password "like" the the hash 512 hash it into something like this"4ssf5789sd543s" and another user "aslam" have the same password then it mean's they both have same hashe's
how can i differ it from one another.
using "salt" individually? if yes the how ?

THANK"S .

Posted 24-May-13 19:12pm

msz900

Updated 24-May-13 19:15pm

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Sergey Alexandrovich Kryukov 25-May-13 1:49am

So what? What would be the scenario when something needs to "differ" one from another? If you think about it, you will see that there is no such thing.
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-05-24T19:50:00

Solution 1

Please see my comment to the question.

Yes, but this is not a problem, because the server part stores password cache values indexed by user names. Jon and Aslam do not know that their passwords are identical unless one tried to log in representing another one with own password. Also it's important that no one would be able to find out any of original passwords (more exactly, this is what called "infeasible" in cryptography), even having the access to the storage of user names and password cache.

—SA

Posted 24-May-13 19:50pm

Sergey Alexandrovich Kryukov

Comments

msz900 25-May-13 2:44am

how can i add salt.. i try like this

hash($_POST['pass'],"salt")

and it work's.
is it th true process?

Sergey Alexandrovich Kryukov 25-May-13 19:26pm

No, first parameter is algorithm, followed by data and then optional Bool:
http://php.net/manual/en/function.hash.php

I never tried it, but you can check with documentation:
http://www.google.com/url?sa=t&rct=j&q=PHP+hash&source=web&cd=2&cad=rja&ved=0CDQQFjAB&url=http%3A%2F%2Fphp.net%2Fmanual%2Fen%2Fbook.hash.php&ei=jkihUYudN9TG4APb64DABA&usg=AFQjCNF9gbGQI6lH4lLHuEa250lk4USxrA

—SA