Posted by Satyam on 04/22/05 17:56

If you are happy with infinite answers, I guess that is Ok. In practice,
since you would probably wouldn't expect numbers (or strings) infinetly
long, assuming that you just have N possible initial values, you would have
N/3 possible answers.

I thought the question was about getting one answer.


"Greg Donald" <destiney@gmail.com> wrote in message
news:ea9da26c05042109341fd168b3@mail.gmail.com...
On 4/21/05, Satyam <satyam@satyam.com.ar> wrote:
> If I tell you that dividing a certain number by three gives you a
> remainder
> of 2, would you be able to guess the first number?

Yes. 5, 8, 11, 14, etc.

> Same thing with MD5, it
> is just one way, it can't be reversed.

MD5 collisions were found last year:
http://cryptography.hyperlink.cz/md5/MD5_collisions.pdf

Just a matter of time/cpu power.


--
Greg Donald
Zend Certified Engineer
http://destiney.com/

[Back to original message]