@misc{cryptoeprint:2014:104,
author = {Kévin Atighehchi},
title = {Space-efficient, byte-wise incremental and perfectly private encryption schemes},
howpublished = {Cryptology ePrint Archive, Report 2014/104},
year = {2014},
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.