On Sun, Mar 15, 2009 at 10:25:11PM +0100, Martin Zvarík wrote: > I want to store the file's hash to the database, so I can check next > time to see if that file was already uploaded (even if it was renamed). > > What would be the best (= fastest + small chance of collision) algorithm > in this case? > > Is crc32 a good choice? > > Thank you in advance, > Martin
According to wikipedia, a CRC is not sufficient to detect intentional alteration of a file/message, since it's relatively easy to design a message/file which will have the same CRC. On the other hand, CRC, by design will reliably detect subtle changes to a message/file. Paul -- Paul M. Foster -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
