[curves] Scalar decomposition for FourQ

Chiraag Juvekar chiraag.juvekar at gmail.com
Sat Mar 25 12:49:50 PDT 2017

Hi all,

I had a question about the scalar decompositions in FourQ and I was not
sure on who to ask. I hope that it is not out of place for this mailing
list. I wanted to avoid implementing the scalar decomposition logic for a
low-resource implementation. I was wondering if it is secure to directly
select the decomposed scalar as 4 random 64-bit numbers when running DH on
FourQ? I know for example that this is true in the context of \tau-adic
expansions for Koblitz curves where we can pick a random \tau-NAF directly
instead of implementing a converter.

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