@misc{cryptoeprint:2013:695,
author = {Hongjun Wu and Bart Preneel },
title = {AEGIS: A Fast Authenticated Encryption Algorithm},
howpublished = {Cryptology ePrint Archive, Report 2013/695},
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.