al-kindi.gnupg.org

Abu Yūsuf Yaʻqūb ibn ʼIsḥāq aṣ-Ṣabbāḥ al-Kindī (801-873)
                            - "Philosopher of the Arabs"

        His manuscript "On Deciphering Cryptographic Messages", has the
        oldest known description of cryptanalysis by frequency analysis.


You probably wanted to access dev.gnupg.org