note 39622 deleted from function.uniqid by aidan

From: Date: Sun, 07 Nov 2004 11:51:47 +0000
Subject: note 39622 deleted from function.uniqid by aidan
References: 1  Groups: php.notes 
Request: Send a blank email to php-notes+get-80223@lists.php.net to get a copy of this message
Note Submitter: tbreslowREMOVE-NOSPAM at yahoo dot com ---- the idea that two strings out of 50,000 could evaluate to the same md5 hash is quite impossible. there are 2^128 MD5 values. an interesting proof showed that given 10^19 inputs there would still be less than a 50% probability of a duplicate hash. assuming you had a computer that could process md5 hashes in 1 ms it would take 10^19ms (370,000 years) of hashing to have less than 50% chance of finding a duplicate. if you really did find two strings that have the same md5 hash you will be quite famous. see http://www.cs.bham.ac.uk/~mdr/teaching/modules/security/hash.html for the proof.</p>

« previous php.notes (#80223) next »