Cryptology ePrint Archive: BibTeX Citation of Report 2006/245

@misc{cryptoeprint:2006:245,
    author = {K. Phani Kumar and G. Shailaja and Ashutosh Saxena},
    title = {Secure and Efficient Threshold Key Issuing Protocol for ID-based Cryptosystems},
    howpublished = {Cryptology ePrint Archive, Report 2006/245},
    year = {2006},
    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.