[Cryptography] What do we mean by Secure?

[Ben Laurie]

On 10 February 2015 at 04:54, Richard Outerbridge <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.
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