Cryptology ePrint Archive: BibTeX Citation of Report 2018/591

@misc{cryptoeprint:2018:591,
    author       = {Sankhanil  Dey and
		    Ranjan Ghosh},
    title        = {4-bit crypto S-boxes: Generation with irreducible polynomials over Galois field GF(24) and cryptanalysis.},
    howpublished = {Cryptology ePrint Archive, Report 2018/591},
    year         = {2018},
    note         = {\url{https://ia.cr/2018/591}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.