@misc{cryptoeprint:2014:610,
author = {Craig Gentry},
title = {Computing on the Edge of Chaos: Structure and Randomness in Encrypted Computation},
howpublished = {Cryptology ePrint Archive, Report 2014/610},
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.