@misc{cryptoeprint:2012:092,
author = {Yossef Oren and Avishai Wool},
title = {Tolerant Algebraic Side-Channel Analysis of {AES}},
howpublished = {Cryptology ePrint Archive, Report 2012/092},
year = {2012},
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.