@misc{cryptoeprint:2014:590,
author = {Joeri de Ruiter},
title = {Automated algebraic analysis of structure-preserving signature schemes},
howpublished = {Cryptology ePrint Archive, Report 2014/590},
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.