@misc{cryptoeprint:2015:807,
author = {Juan Garay and
Björn Tackmann and
Vassilis Zikas},
title = {Fair Distributed Computation of Reactive Functions},
howpublished = {Cryptology ePrint Archive, Report 2015/807},
year = {2015},
note = {\url{https://ia.cr/2015/807}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.