Cryptology ePrint Archive: BibTeX Citation of Report 2013/240

@misc{cryptoeprint:2013:240,
    author = {Sui-Guan Teo and Kenneth Koon-Ho Wong and Harry Bartlett and Leonie Simpson and Ed Dawson},
    title = {Algebraic analysis of Trivium-like ciphers},
    howpublished = {Cryptology ePrint Archive, Report 2013/240},
    year = {2013},
    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.