@misc{cryptoeprint:2006:295,
author = {Feng Yi and Daoshun Wang and Yiqi Dai},
title = {Visual secret sharing scheme with autostereogram},
howpublished = {Cryptology ePrint Archive, Report 2006/295},
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.