Cryptology ePrint Archive: BibTeX Citation of Report 2004/376

@misc{cryptoeprint:2004:376,
    author = {Shujun Li and Chengqing Li and Guanrong Chen and Kwok-Tung Lo},
    title = {Cryptanalysis of RCES/RSES Image Encryption Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2004/376},
    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.