This is a monographic, bipartite substitution (see substitutions and permutations) V 25 → W 5 2, known in antiquity (Polybios) for the Greek alphabet. In a modern form, a standard alphabet Z 25 (left) or a mixed alphabet V 25 (right) is inscribed into a 5 × 5 checkerboard (Polybios square), like
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References
Bauer, F.L. (1997). “Decrypted secrets.” Methods and Maxims of Cryptology. Springer-Verlag, Berlin.
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Bauer, F.L. (2005). Polybios Square Encryption. In: van Tilborg, H.C.A. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA . https://doi.org/10.1007/0-387-23483-7_306
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DOI: https://doi.org/10.1007/0-387-23483-7_306
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