@misc{cryptoeprint:2010:115,
author = {Jason Bau, and John C Mitchell},
title = {A Security Evaluation of DNSSEC with NSEC3},
howpublished = {Cryptology ePrint Archive, Report 2010/115},
year = {2010},
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.