@misc{cryptoeprint:2014:1006,
author = {Jaime Gaspar and Eerke Boiten},
title = {Simple composition theorems of one-way functions -- proofs and presentations},
howpublished = {Cryptology ePrint Archive, Report 2014/1006},
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.