@misc{cryptoeprint:2010:416,
author = {Michael Backes and Matteo Maffei and Dominique Unruh},
title = {Computationally Sound Verification of Source Code},
howpublished = {Cryptology ePrint Archive, Report 2010/416},
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.