Between which years did John Wallis serve as chief cryptographer?
1643 and 1689
1600 and 1650
1670 and 1700
1650 and 1699
Answer
John Wallis served as chief cryptographer for the English Parliament from 1643 to 1689. During this time, he was responsible for deciphering intercepted messages from the Royalists and for developing new ciphers for use by the Parliamentarians. Wallis was a brilliant mathematician and cryptographer, and his work in these areas was instrumental in the Parliament's victory in the English Civil War.
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