@misc{cryptoeprint:2010:624,
author = {Dima Grigoriev and Vladimir Shpilrain},
title = {No-leak authentication by the Sherlock Holmes method},
howpublished = {Cryptology ePrint Archive, Report 2010/624},
year = {2010},
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.