The Beaufort cipher, created by Sir Francis Beaufort, is a substitution cipher similar to the Vigenère cipher, with a slightly modified enciphering mechanism and tableau.
Whereas other wartime officers sought leisurely pursuits, Beaufort spent his leisure time taking soundings and bearings, making astronomical observations to determine longitude and latitude, and measuring shorelines.
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His mother Mary was the daughter and co-heiress of William Waller, of Allenstown, County Meath.
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