The story
The cipher's invention was attributed by Gaspar Schott to Count Gronsfeld (Josse Maximilaan van Gronsveld né van Bronckhorst).
Etymology from Wiktionary, CC BY-SA 4.0.
Gronsfeld cipher
Today it means: A variant of the Vigenère cipher that uses only ten different cipher alphabets, corresponding to the digits 0 to 9. Full definition →