[Cryptography] Perfect Integrity?

[Jerry Leichter]

> I have to say, I find some of the discussion surrounding this question
> rather silly.
Absolutely.

> We need to first rigorously define a notion of "information-theoretic
> message authentication" before asking whether it is achievable. (You
> may or may not like the definition I propose, but arguing without any
> definition in place is just a waste of energy. And you are free to
> suggest your own definition as long as you can express it formally so
> I know precisely what you mean.)
I provided one possible definition - which is similar to the one you described - in a message a couple of days ago.  It seems to have dropped in to the bit bucket - if it wasn't received, I can re-send it.
                                                        -- Jerry