Changing preferences

David Shaw dshaw at
Mon Sep 22 17:28:09 CEST 2008

On Mon, Sep 22, 2008 at 02:37:17AM -0500, Robert J. Hansen wrote:
> Faramir wrote:
> >> No, but they may be operating on the assumption their preference list
> >> matters.  (Which it very often doesn't; encrypting-to-self and another
> >> recipient means there's a 50/50 chance their preference list will be
> >> treated as a cap set.  It would appear this ought to be made clear in
> >> the docs.)
> > 
> >   What do you mean? I didn't understand the "cap set" concept, or at
> > least, the meaning of these words (I think probably is due my lack of
> > vocabulary...).
> Imagine a group of people are going to the movies.
> "I'd like to see either _Iron Man_, _The Incredible Hulk_, or _The Dark
> Knight_."
> Compare to:
> "I'd like to see _The Incredible Hulk_.  If that's not possible, I'd
> like to see _The Dark Knight_.  If neither of them are possible, I'd
> like to see _Iron Man_."
> The first one says "I'd like to see any of these movies and I don't care
> which we choose."  This is a capability set.
> The second one says "while I'll watch any of them, I would prefer _The
> Incredible Hulk_."  This is a preference list.

Good analogy.  I usually explain it with pizza toppings ("I like
pepperoni or mushrooms, but hate anchovies").  3DES is then the plain
cheese pizza that everyone can settle on if they have to.


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