Cryptology ePrint Archive: BibTeX Citation of Report 2008/506

@misc{cryptoeprint:2008:506,
    author = {Kannan Srinathan and Arpita Patra and Ashish Choudhary and C. Pandu Rangan},
    title = {Unconditionally Secure Message Transmission in Arbitrary Directed Synchronous Networks Tolerating Generalized Mixed Adversary},
    howpublished = {Cryptology ePrint Archive, Report 2008/506},
    year = {2008},
    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.