Reza Rezaeian Farashahi Ruud Pellikaan Andrey Sidorenko Extractors for binary elliptic curves. 171-186 2008 49 Des. Codes Cryptography 1-3 http://dx.doi.org/10.1007/s10623-008-9187-5 db/journals/dcc/dcc49.html#FarashahiPS08