@misc{cryptoeprint:2007:246,
author = {Claudio Soriente and Gene Tsudik and Ersin Uzun},
title = {BEDA: Button-Enabled Device Pairing},
howpublished = {Cryptology ePrint Archive, Report 2007/246},
year = {2007},
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.