@misc{cryptoeprint:2006:394,
author = {Sunder Lal and Vandani Verma},
title = {Identity Based Strong Designated Verifier Proxy Signature Schemes},
howpublished = {Cryptology ePrint Archive, Report 2006/394},
year = {2006},
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.