Cryptology ePrint Archive: BibTeX Citation of Report 2015/136

@misc{cryptoeprint:2015:136,
    author = {Marcos A. Simplicio Jr. and Leonardo C. Almeida and Ewerton R. Andrade and Paulo C. F. dos Santos and Paulo S. L. M. Barreto},
    title = {Lyra2: Password Hashing Scheme with improved security against time-memory trade-offs},
    howpublished = {Cryptology ePrint Archive, Report 2015/136},
    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.