@misc{cryptoeprint:2015:765,
author = {Victoria Fehr and Marc Fischlin},
title = {Sanitizable Signcryption: Sanitization over Encrypted Data (Full Version)},
howpublished = {Cryptology ePrint Archive, Report 2015/765},
year = {2015},
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.