@misc{cryptoeprint:2014:306,
author = {Yu Chen and Zongyang Zhang},
title = {Publicly Evaluable Pseudorandom Functions and Their Applications},
howpublished = {Cryptology ePrint Archive, Report 2014/306},
year = {2014},
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.