Cryptology ePrint Archive: BibTeX Citation of Report 2007/103

@misc{cryptoeprint:2007:103,
    author = {Roberto Avanzi},
    title = {Another Look at Square Roots and Traces (and Quadratic Equations) in Fields of Even Characteristic},
    howpublished = {Cryptology ePrint Archive, Report 2007/103},
    year = {2007},
    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.