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 M. Foster

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