Martin Geisler <[EMAIL PROTECTED]> writes:
> Martin Geisler <[EMAIL PROTECTED]> writes:
>
>> Mikkel and I restructured some code yesterday in preparation for
>> implementing a Bracha broadcast, which in turn will help implement
>> protocols for active security.
>
> As you might have seen on http://viff.dk/, Mikkel has committet a
> Bracha broadcast, great!
>
> This is currently implemented fully asymmetrically, by which I mean
> that only one player can give input. So for each player to broadcast a
> value one would write
>
> if runtime.id == 1:
> a = runtime.broadcast(1, "foo")
> b = runtime.broadcast(2)
> if runtime.id == 2:
> a = runtime.broadcast(1)
> b = runtime.broadcast(2, "bar")
> if runtime.id == 3:
> a = runtime.broadcast(1)
> b = runtime.broadcast(2)
>
> This does not match the shamir_share method, which allows you to write
>
> a, b = runtime.shamir_share([1, 2], input)
>
> where input is different for each of the two inputters.
That code is actually wrong, the correct code would be:
if runtime.id == 1 or runtime.id == 2:
a, b = runtime.shamir_share([1, 2], input)
else:
a, b = runtime.shamir_share([1, 2])
That makes the difference between the broadcast and shamir_share
methods even smaller. Is the magic still needed then?
--
Martin Geisler
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