Computing directly on the field elements is hacking the abstractions of VIFF. Computation on field elements or rather the representation of a Share can be useful as an optimization, however this optimization
should be confined within applications or runtimes, and should not
progress over interface boundaries as I fear you are suggesting.
I think we are in agreement: public methods on the runtimes will keep returning Shares. Methods used internally in runtimes can return other
things as needed. To me it sounds like a better API to require
preprocessing functions to return a list of Deferreds:
[D(?), D(?), ...],
instead of a Deferred list of tuples containing Deferreds :-)
I think it will simplify the interface nicely, at least for consumers. Using simpler types also leads to less memory usage which has a positive
effect on performance, as Marcel notes. So let's go for it.


So this makes 2 votes in favour of it and 1 against it. Maybe we should have a meeting to discuss it. What do you think?
I can agree on this as well, as long as we don't make field elements canonical.

You mean that the preprocessing infrastructure should not be restricted to FieldElements but can handle other items such as the tuples used by the Orlandi runtime. Is that correct? It was never my plan to introduce this restriction. I just want to get rid of the Deferreds in the preprocessing pool because I think that they are unnecessary there.
Then by all means go ahead and speed up the preprocessing. :)

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Janus Dam Nielsen

Research and Innovationspecialist, PhD.
CENTRE FOR IT-SECURITY

THE ALEXANDRA INSTITUTE LTD.

T +45 42 22 93 56
E janus.niel...@alexandra.dk
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