Cryptology ePrint Archive: BibTeX Citation of Report 2015/757

@misc{cryptoeprint:2015:757,
    author = {Matthias Hamann and Matthias Krause},
    title = {Stream Cipher Operation Modes with Improved Security against Generic Collision Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2015/757},
    year = {2015},
    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.