Cryptology ePrint Archive: BibTeX Citation of Report 2011/545

@misc{cryptoeprint:2011:545,
    author = {Masao Kasahara},
    title = {Public Key Cryptosystems Constructed Based on Random Pseudo Cyclic Codes, K(IX)SE(1)PKC, Realizing Coding Rate of Exactly 1.0},
    howpublished = {Cryptology ePrint Archive, Report 2011/545},
    year = {2011},
    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.