Cryptology ePrint Archive: BibTeX Citation of Report 2011/072

@misc{cryptoeprint:2011:072,
    author = {Jiali Choy and Aileen Zhang and Khoongming Khoo and Matt Henricksen and Axel Poschmann},
    title = {AES Variants Secure Against Related-Key Differential and Boomerang Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2011/072},
    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.