@misc{cryptoeprint:2015:559,
author = {Ran Canetti and Vipul Goyal and Abhishek Jain},
title = {Concurrent Secure Computation with Optimal Query Complexity},
howpublished = {Cryptology ePrint Archive, Report 2015/559},
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.