[Cryptography] What do we mean by Secure?

[Dave Horsfall]

On Tue, 10 Feb 2015, Stephan Neuhaus wrote:

> > 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.

I've always understood it to mean something like "you cannot prove an 
absence of anything."

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Dave Horsfall DTM (VK2KFU)  "Bliss is a MacBook with a FreeBSD server."
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