@misc{cryptoeprint:2014:246,
author = {Kwangsu Lee and Dong Hoon Lee},
title = {Security Analysis of an Identity-Based Strongly Unforgeable Signature Scheme},
howpublished = {Cryptology ePrint Archive, Report 2014/246},
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.