@misc{cryptoeprint:2015:584,
author = {Denise Demirel and Jean Lancrenon},
title = {How to Securely Prolong the Computational Bindingness of Pedersen Commitments},
howpublished = {Cryptology ePrint Archive, Report 2015/584},
year = {2015},
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.