[viff-devel] Floating point operation [Re. to Martin's message]

[Martin Geisler]

Mikkel Krøigård <mk at daimi.au.dk> writes:

>> Say, if a and b are two floating point numbers that are secret-shared
>> between members (e.g. additively), then we want to compute:
>> c = a # b
>> where # is one of { *, / , + , - }
>
> VIFF was built to handle integers and currently does not support
> floating point numbers or rationals.

Yes, you're right -- so far we only have arithmetic with elements from
finite fields.

> This does not mean that it is not a concern, but we (or maybe it's
> just me?) are not aware of any really nice way to handle this problem,
> but I am quite interested in finding one.

Me too! Division is the only missing piece out of the four standard
arithmetic operations taught in school :-)

> I have read the "Cryptocomputing with rationals" paper, and although
> it is a nice idea it does not really solve the whole thing.

Could you outline the problems so that I wont have to read it? :-)

-- 
Martin Geisler

VIFF (Virtual Ideal Functionality Framework) brings easy and efficient
SMPC (Secure Multi-Party Computation) to Python. See: http://viff.dk/.
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