[Cryptography] of possible historical interest: John Wallis

[Mark Seiden]

Between 1643 and 1689, John Wallis served as chief cryptographer for Parliament and, later, the royal court. He is also credited with introducing the symbol ∞ for infinity.

https://www.atlasobscura.com/articles/john-wallis-cryptography

reports

"On October 7, 2020, Dominic Winter Auctioneers <https://www.dominicwinter.co.uk/Auction/Lot/375-wallis-john-a-collection-of-letters-intercepted-in-cipher-during-the-late-warres-in-england-1653/?lot=361781&so=2&st=&sto=0&au=751&ef=&et=&ic=False&sd=0&pp=24&pn=1&g=1> in England sold a collection of 53 letters deciphered by Wallis, for £29,000 (roughly $37,000)."


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