=ADD= =reftype= 14 =number= 02-16 =url= ftp://ftp.risc.uni-linz.ac.at/pub/techreports/2002/02-16.ps.gz =year= 2002 =month= 07 =author= Athale; Rahul + Winkler ; Franz =title= Curves in Cryptography =abstract= Here, we give two examples of ElGamal cryptosystem, one of which uses the group of rational points on an elliptic curve. We mention the possible research problems. =note= The original version of this paper was presented as a poster at ISSAC 2001. =sponsor= RISC PhD scholarship program of the government of Upper Austria. =keywords= Publik key cryptosystem, elliptic and hyperelliptic curves.