@misc{cryptoeprint:2006:151,
author = {Ralf Kuesters},
title = {Simulation-Based Security with Inexhaustible Interactive Turing Machines},
howpublished = {Cryptology ePrint Archive, Report 2006/151},
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.