@misc{cryptoeprint:2014:544,
author = {Amitabh Das, Dusko Karaklajic and Ingrid Verbauwhede},
title = {Secure Mutual Testing Strategy for Cryptographic SoCs},
howpublished = {Cryptology ePrint Archive, Report 2014/544},
year = {2014},
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.