Atbah-Type Ciphers in the Christian Orient and Numerical Rules in the Construction of Christian Substitution Ciphers
This article presents Christian ciphers (counterparts of the well-known Hebrew atbah cipher) used in main languages and scripts of the Christan Orient: in Greek, Coptic, and Syriac, in Late Antiquity and the Middle Ages. The article also describes other alphabetic substitution ciphers used in these languages and highlights numerical rules in their construction.
atbah substitution ciphers greek coptic syriac caesar cipher christian oriental ciphers