Cryptology ePrint Archive: BibTeX Citation of Report 2015/123

@misc{cryptoeprint:2015:123,
    author = {Dennis Hofheinz and Jessica Koch and Christoph Striecks},
    title = {Identity-based encryption with (almost) tight security in the multi-instance, multi-ciphertext setting},
    howpublished = {Cryptology ePrint Archive, Report 2015/123},
    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.