@misc{cryptoeprint:2013:841,
author = {Johannes Braun, Florian Volk, Johannes Buchmann and Max Mühlhäuser},
title = {Trust Views for the Web PKI},
howpublished = {Cryptology ePrint Archive, Report 2013/841},
year = {2013},
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.