Beyond Espionage: Cryptography for Everyday Use in 17th Century England
By Susanna Calkins
February 7, 2021Cryptography in seventeenth-century England was not just the stuff of spies and traitors, a fact that became a major plot point in The Sign of the Gallows, my fifth Lucy Campion historical mystery. While ciphers had grown more complex between the 16th and 17th centuries with the development of new mathematics, the actual practice of…