October 2002
Intermediate to advanced
368 pages
7h 12m
English
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Generating Passwords
The md5() and crypt() functions encrypt passwords, but they cannot be unencrypted. These are one-way algorithms. You can verify that the users' password matches the password they were initially given by comparing the md5() or crypt() output of the password they use to subsequently enter the site. The two encrypted versions of the same string match (assuming that the same “salt” is used to create the password using the crypt() function).
This is good, because you never store a user's actual password. If your password file falls into the wrong hands, there is little that anybody can do with it. It is very hard to unencrypt a password encrypted by md5() or crypt(). Since you don't store the user's actual password, malicious ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.