Cryptology ePrint Archive: BibTeX Citation of Report 2015/844

@misc{cryptoeprint:2015:844,
    author = {Jeff Hoffstein and Jill Pipher and John M. Schanck and Joseph H. Silverman and William Whyte and Zhenfei Zhang},
    title = {DA-Encrypt: Homomorphic Encryption via Non-Archimedean Diophantine Approximation --- Preliminary Report},
    howpublished = {Cryptology ePrint Archive, Report 2015/844},
    year = {2015},
    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.