@misc{cryptoeprint:2010:470,
author = {Feli\'u Sagols and Guillermo Morales-Luna},
title = {Two identification protocols based on Cayley graphs of Coxeter groups},
howpublished = {Cryptology ePrint Archive, Report 2010/470},
year = {2010},
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.