@misc{cryptoeprint:2014:226,
author = {Mohamed Ahmed Abdelraheem and Andrey Bogdanov and Elmar Tischhauser},
title = {Weak-Key Analysis of POET},
howpublished = {Cryptology ePrint Archive, Report 2014/226},
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.