@misc{cryptoeprint:2011:352,
author = {Adam O'Neill and Chris Peikert and Brent Waters},
title = {Bi-Deniable Public-Key Encryption},
howpublished = {Cryptology ePrint Archive, Report 2011/352},
year = {2011},
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.