@misc{cryptoeprint:2015:063,
author = {R. Benadjila and T. Calderon and M. Daubignard},
title = {CamlCrush: A PKCS\#11 Filtering Proxy},
howpublished = {Cryptology ePrint Archive, Report 2015/063},
year = {2015},
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.