Cryptology ePrint Archive: BibTeX Citation of Report 2015/618

@misc{cryptoeprint:2015:618,
    author = {Juan Carlos Ku-Cauich 
 Guillermo Morales-Luna 
 Horacio Tapia-Recillas},
    title = {An Authentication Code over Galois Rings with Optimal Impersonation and Substitution Probabilities},
    howpublished = {Cryptology ePrint Archive, Report 2015/618},
    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.