An elliptic curve encryption system represents coordinates of a point on the curve as a vector of binary digits in a normal basis representation in F.sub.2.spsb.m. A key is generated from multiple additions of one or more points in a finite field. Inverses of values are computed using a finite field...http://www.google.de/patents/US6141420?utm_source=gb-gplus-sharePatent US6141420 - Elliptic curve encryption systems
