Cryptology ePrint Archive: BibTeX Citation of Report 2010/532

@misc{cryptoeprint:2010:532,
    author = {Andrey Bogdanov and Christian Rechberger},
    title = {A 3-Subset Meet-in-the-Middle Attack: Cryptanalysis of the Lightweight Block Cipher KTANTAN},
    howpublished = {Cryptology ePrint Archive, Report 2010/532},
    year = {2010},
    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.