ニュース

What is pigpen cipher – the ancient code in JK Rowling’s ‘The Hallmarked Man’

J K Rowling’s The Hallmarked Man features the Pigpen Cipher, a centuries-old code once used by Freemasons and revolutionaries ...
insider.si.edu1月

Codes and ciphers : Julius Caesar, the Enigma, and the internet / R.F. Churchhouse

1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...