Taĭnopisʹ v i︠u︡go-slavi︠a︡nskikh i russkikh pami︠a︡tnikakh pisʹma
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The book by the Russian philologist M.N. Speransky is dedicated to the study of cryptographic systems of the south-Slavic and Russian written monuments. The author describes in detail various types of cryptography used in the south-Slavic and Russian literary monuments: acrostic, reverse writing and pictograph, ligature writing, numerical cryptography, system of changes and deformed pattern, as well as various cryptographic combinations.
