Re: probably cluelessly beating a dead horse

hi Toby (et. al)

>  Do you mean, given some capability, c, perform some operation that
>  returns c1 and c2, such that c1 and c2 must be used together to achieve
>  what could have been done with c?

totally, yup, right, yes.

>  If so, can't we achieve that using sealer/unsealers ?

Funny you should mention that... it actually struck me that in my
example (for whatever it might be worth), the S/U pairs were overkill,
I think [assuming we can have (c1,c2)=c]. Since each half of the
capability is powerless on its own, and since part of the assumption
of the problem is that Alice & Bob are not in cahoots, and since with
the S/U system in this problem you can never avoid Alice and/or Bob
from injecting their own U' and thus seeing the content of half of the
capability, then one might as well just send it plain-text through
them.

But it would still need the ability to split the capability in half,
which brings us to your idea of using S/U to achieve that! :-) Cool.

sincerely.