Polybius greek tablets

Polybius greek tablets

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Credit: SCIENCE PHOTO LIBRARY

Caption: Polybius greek tablets. Artwork of tablets depicting the Polybius square (see image V400/0161), a device used in encryption and telegraphy. The square was first described by the ancient Greek scholar Polybius in around 200BC and works by replacing each letter of the Greek alphabet with a pair of grid co-ordinates. For example, beta (B) would become 12. Polybius conceived of this device as a way of transmitting messages optically with a pair of torches. For an artwork of the system in practice, see image V400/0090.

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