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This is a monographic, bipartite substitution (substitutions and permutations) \({V }_{25} \rightarrow { {W}_{5}}^{2}\), 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
An encryption example is given by: heaven ↦ 23151151121533 resp. heaven ↦ 411512511525
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Recommended Reading
Bauer FL (1997) Decrypted secrets. In: Methods and maxims of cryptology. Springer, Berlin.
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© 2011 Springer Science+Business Media, LLC
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Bauer, F.L. (2011). Polybios Square Encryption. In: van Tilborg, H.C.A., Jajodia, S. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5906-5_173
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DOI: https://doi.org/10.1007/978-1-4419-5906-5_173
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