@misc{cryptoeprint:2013:105,
author = {Yuval Ishai and Eyal Kushilevitz and Omer Strulovich},
title = {Lossy Chains and Fractional Secret Sharing},
howpublished = {Cryptology ePrint Archive, Report 2013/105},
year = {2013},
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.