Re: Compute Hash Code

Even with MD5, there are possibilities of different input values
generating the same key.  I was just reading an article the other day
that demonstrates this weakness.  I am not sure if I can send out
links on this list, but if I can, the link is here:

http://www.doxpara.com/md5_someday.pdf


On Wed, 8 Dec 2004 17:10:38 -0600 (CST), Scott Klement
<rpg400-l@xxxxxxxxxxxxxxxx> wrote:
> 
> Hi,
> 
> On Wed, 8 Dec 2004, Walden H. Leverich wrote:
> > array = '100', '220', '300', '400', '500'
> > hash = (100 * 1) + (220 * 2) + (300 * 3) + (400 * 4) + (500 * 5) = 5540
> > array = '100', '200', '300', '410', '500'
> > hash = (100 * 1) + (200 * 2) + (300 * 3) + (410 * 4) + (500 * 5) = 5540
> >
> > Two different arrays, same hash. Ooops.
> 
> 
> This is a very good illustration of why I wouldn't try to invent my own
> hash code.  I'd use MD5 or something else that's been well-used and
> well-tested.
> 
> 
> 
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