@misc{ref1,
        author = "Wikipedia",
        title = "{RSA} (Cryptosystem) --- {W}ikipedia{,} {D}ie freie {E}nzyklopädie",
        note = "\url{https://en.wikipedia.org/wiki/RSA_(cryptosystem)}",
        year = "2016",
}

@misc{ref2,
        author = "Wikipedia",
        title = "{RSA}-{K}ryptosystem --- {W}ikipedia{,} {D}ie freie {E}nzyklopädie",
        note = "\url{https://de.wikipedia.org/wiki/RSA-Kryptosystem}",
        year = "2016",
}

@misc{ref3,
        author = "L. Van Houtven",
        title = "Crypto 101",
        note = "\url{https://www.crypto101.io}",
        year = "2016",
}