@misc{cryptoeprint:2015:031,
author = {Kai-Min Chung and Rafael Pass},
title = {Tight Parallel Repetition Theorems for Public-Coin Arguments using KL-divergence},
howpublished = {Cryptology ePrint Archive, Report 2015/031},
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.