@misc{cryptoeprint:2011:385,
author = {Azhar Ali Khan and Ghulam Murtaza},
title = {Efficient Implementation of Grand Cru with TI C6x+ Processor},
howpublished = {Cryptology ePrint Archive, Report 2011/385},
year = {2011},
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.