@misc{cryptoeprint:2015:738,
author = {Kazuhiko Minematsu},
title = {Authenticated Encryption without Tag Expansion (or, How to Accelerate AERO)},
howpublished = {Cryptology ePrint Archive, Report 2015/738},
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.