Cryptology ePrint Archive: BibTeX Citation of Report 2004/374

@misc{cryptoeprint:2004:374,
    author = {Shujun Li and Chengqing Li and Guanrong Chen and Nikolaos G. Bourbakis and Kwok-Tung Lo},
    title = {A general quantitative cryptanalysis of permutation-only multimedia ciphers against plaintext attacks},
    howpublished = {Cryptology ePrint Archive, Report 2004/374},
    year = {2004},
    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.