@misc{cryptoeprint:2013:028,
author = {Stanislav Bulygin},
title = {More on linear hulls of PRESENT-like ciphers and a cryptanalysis of full-round EPCBC-96},
howpublished = {Cryptology ePrint Archive, Report 2013/028},
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.