King's College London
Online Exhibitions
Professor Sir Charles Wheatstone

The Cryptograph

Cryptograph devised by Charles WheatstoneCryptograph devised by Charles WheatstoneSir Charles Wheatstone was regarded as an expert on codes.

In the mid 1850s he devised a wheel cryptograph and invented a cipher.

Wheatstone's cipher, later known as the ‘Playfair cipher,’ continued in use into the 20th century.

The Playfair cipher appears in Dorothy L Sayers’ Lord Peter Wimsey adventure, Have His Carcasse and the 2007 film National Treasure 2: Book of Secrets.

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