New stream ciphers based on elliptic curve point multiplication

Three new algorithms for the development of stream cipher based on elliptic curve point multiplication are presented in this paper. Extensive analysis of the properties of keystreams produced by various algorithms available in literature for the generation of Pseudorandom Bit Sequence (PRBS) based on the elliptic curve is carried out. New algorithms are proposed as modifications over these schemes in such a way that the weakness of these schemes in terms of reduced cryptographic strength and periodicity are overcome. Since elliptic curve cryptography is replacing RSA in most of the cryptosystems as the standard for key exchange, an EC based stream cipher provides a good option for encryption using the available infrastructure for elliptic curve point multiplication.