A cryptosystem based on a Jacobian of a hyperelliptic curve is being used. Various methods and apparati are provided for generating a compressed data format that identifies one or more points—on the Jacobian of the hyperelliptic curve, and for subsequently decompressing the compressed format data....http://www.google.de/patents/US7043015?utm_source=gb-gplus-sharePatent US7043015 - Methods for point compression for Jacobians of hyperelliptic curves
