[Cryptography] What do we mean by Secure?

Stephan Neuhaus stephan.neuhaus at zhaw.ch
Tue Feb 10 08:10:59 EST 2015


On 2015-02-10 06:09, Ben Laurie wrote:
>
> On 10 February 2015 at 04:54, Richard Outerbridge <outer at interlog.com
> <mailto:outer at interlog.com>> wrote:
>
>     > It usually has to prove a negative, which is a key difference.
>
>     I think I was taught that was logically, literally, impossible.
>
>
> This is obviously untrue. You can easily prove, for example, that three
> is not equal to four.

Or, to take an example that is probably much closer to what Richard 
meant, that there are no integers p and q such that p^2/q^2 = 2. 
Proving negatives is definitely possible in maths.

Fun,

Stephan


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