Cryptology ePrint Archive: BibTeX Citation of Report 2021/1557

@misc{cryptoeprint:2021:1557,
    author       = {Marco Baldi and
		    Alessandro Barenghi and
		    Franco Chiaraluce and
		    Gerardo Pelosi and
		    Paolo Santini},
    title        = {Performance bounds for QC-MDPC codes decoders},
    howpublished = {Cryptology ePrint Archive, Report 2021/1557},
    year         = {2021},
    note         = {\url{https://ia.cr/2021/1557}},
}

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