Cryptology ePrint Archive: BibTeX Citation of Report 2002/144

@misc{cryptoeprint:2002:144,
    author = {A.M. Youssef and S.E. Tavares},
    title = {On Some Algebraic Structures in the AES Round Function},
    howpublished = {Cryptology ePrint Archive, Report 2002/144},
    year = {2002},
    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.