Cryptology ePrint Archive: BibTeX Citation of Report 2010/203

@misc{cryptoeprint:2010:203,
    author = {Bernard Colbert and Anthony H. Dekker and Lynn Margaret Batten},
    title = {Heraclitus: A LFSR-based Stream Cipher with Key Dependent Structure},
    howpublished = {Cryptology ePrint Archive, Report 2010/203},
    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.