@misc{cryptoeprint:2009:441,
author = {Jayaprakash Kar and Banshidhar Majhi},
title = {An Efficient Two-Party Identity-Based Key Exchange Protocol based on ECDLP},
howpublished = {Cryptology ePrint Archive, Report 2009/441},
year = {2009},
note = {\url{http://eprint.iacr.org/}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.