@misc{cryptoeprint:2013:684,
author = {Marcel Šebek},
title = {Fully Bideniable Public-Key Encryption},
howpublished = {Cryptology ePrint Archive, Report 2013/684},
year = {2013},
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.