Re: Safe to transmit (symmetric) key encrypted with itself?

From: Damien (Damien_The_Unbeliever_at_hotmail.com)
Date: 06/30/05 

Date: 29 Jun 2005 23:32:44 -0700

clem wrote:
> On 27 Jun 2005 09:30:56 -0700, tomstdenis@gmail.com wrote:
>
> >
> >
> >Pubkeybreaker wrote:
> >> "
> >>
> >> Assuming a symmetric cipher (say, DES or Rijndael), and some key K, is
> >> it safe to transmit K encrypted with itself, K(K), from A to B?"
> >>
> >> What would be the point? To unwrap the key, you would need to already
> >> know
> >> the key!!!!
> >
> >Oh oh, this is where I point out how stupid you are for missing the
> >fact that he said he already shared K.
> >
> >... is it?
> >
>
> Or is this where you look below average for not recognizing that
> Pubketbreaker's message implied that he is fully aware that both A and
> B already have K?
>
> His "What would be the point?" is a valid concern.
>
I think Toms comment was concerning the whole paragrpah - if he was
already aware that A and B already have K, why was "What would be the
point?" followed by "To unwrap the key, you would need to already know
the key!!!!" - That's 4 exclamation marks, which seems a little extreme
maybe if you're already clear that they do know the key.

Damien

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