Hi, Hmmm okay... So if the passowrd was.
jerry and the md5 output was SKHDJHDJDHJDHSfdfs and another user sets their passowrd to the same as mine does that mean the md5 output would be identical to the last as the same password is entered? e.g. User 1: Username: Fred Password: jerry User 2: Username: notfred Password: jerry Or is each entry unique ? I'm thinking if each entry was unique than reversing the md5 action could be inconclusive. But if the output is the same if the same password is entered than sure it's reliable. But I could be barking up the wrong tree all together here, so correct me if I am wrong. I have not used md5 before so learning on that behalf. Jerry --- [EMAIL PROTECTED] wrote: > Just use brute force... > Example: > md5('password') will ALWAYS produce the same output! > So, if I intercept a pmd5 encrypted password that > looks like: SKHGDOIUYFB > then I could just say: > if (strcmp (md5('password'), SKHGDOIUYFB) == 0) > printf("Your password is: %s\n", password); > > So, just start a loop going through all possible > combinations od legal password > character and encrypt with md5, then compare. > > Hard? Not at all, Time consuming, perhaps, but with > 3+ Ghz processors coming > out you'd be surprised how quickly one could loop > through billlions of possible > password combinations. Enter distributed > environments and it is much fatser. > The key is not to rely on passwords but to rely on > other system security > messures, use SSL, so it is hard to intercept in the > first place, make sure > your system is secure so these passwords cannot be > extracted from your DB > without you knowing about it, etc... > > > > > Marco, > > > > Thanks, that's what I originally thought that it > was > > one way. So websites that have the option to > retrieve > > password don't use md5? > > > > I guess technically there MUST be a way to break > the > > barrier where you can reverse it. If there is a > way > > to make it there is always a way to break it, > somehow. > > !!!! But what I have heard and read it's very > tight > > and probably the best method to handle passwords > for > > now, until something new is released. Which will > > happen when md5 is broken, like everything else > after > > a little bit of time. > > > > Jerry > > > > --- Marco Tabini <[EMAIL PROTECTED]> wrote: > Hi > > Jerry-- > > > > > > No, md5 is a one-way hash. That's why it's so > > > safe--because if someone > > > steals the information he still can't tell what > the > > > passwords are. > > > > > > You may want to reset the passwords upon your > users' > > > request and send it > > > to them via e-mail instead. > > > > > > Cheers, > > > > > > > > > Marco > > > > > > -- > > > php|architect -- The Magazine for PHP > Professionals > > > Come try us out at http://www.phparch.com and > get a > > > free trial issue > > > > > > > > > On Tue, 2003-06-24 at 08:35, JeRRy wrote: > > > > Hi, > > > > > > > > If I use md5 to handle passwords to my > database is > > > > there a way to reverse the action if someone > > > forgets > > > > their password? Is there a way for me to > decode > > > the > > > > 32bit to plain text? > > > > > > > > Jerry > > > > > > > > http://mobile.yahoo.com.au - Yahoo! Mobile > > > > - Check & compose your email via SMS on your > > > Telstra or Vodafone mobile. > > > -- > > > > > > Marco Tabini > > > President > > > > > > Marco Tabini & Associates, Inc. > > > 28 Bombay Avenue > > > Toronto, ON M3H 1B7 > > > Canada > > > > > > Phone: (416) 630-6202 > > > Fax: (416) 630-5057 > > > Web: http://www.tabini.ca > > > > > > > > > -- > > > PHP Database Mailing List (http://www.php.net/) > > > To unsubscribe, visit: > http://www.php.net/unsub.php > > > > > > > http://mobile.yahoo.com.au - Yahoo! Mobile > > - Check & compose your email via SMS on your > Telstra or Vodafone mobile. > > > > -- > > PHP Database Mailing List (http://www.php.net/) > > To unsubscribe, visit: > http://www.php.net/unsub.php > > > > > > http://mobile.yahoo.com.au - Yahoo! Mobile - Check & compose your email via SMS on your Telstra or Vodafone mobile. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php