Re: [PHP4BETA] UUIDs
| From: | Monte Ohrt | Date: | Wed, 23 Jun 1999 13:32:11 +0000 |
| Subject: | Re: [PHP4BETA] UUIDs | ||
| References: | 1 2 3 4 5 6 7 | Groups: | php.version4 |
| Request: | Send a blank email to php-version4+get-1676@lists.php.net to get a copy of this message | ||
Kristian Köhntopp wrote:
>
> Monte Ohrt wrote:
> > These numbers are guaranteed unique. But are they guessable? Secure?
> > Make your own observation :-)
>
> I do not understand in how far this is easier, smaller or more secure
> than md5(uniqid($secret))...
>
> Kristian
>
I don't think anyone said it was. If you have the need for guaranteed
uniqueness, UUID is an algorithm that does just that. I believe md5()
could generate a duplicate id, although its highly unlikely.
For a temporary session ID, md5() sounds sufficient. But if someone is
using that session ID as a permanent customer ID and cannot chance that
it could ever be duplicated, maybe UUID is a safer choice.
Monte