References for Further Reading
1.
The Code Book: The Evolution of Secrecy from Mary, Queen of Scots to Quantum Cryptography
- Simon Singh (1999)
2. The Kids' Code and Cipher Book (Holt Owlet) Nancy Garden (1981)
3. Codes and Ciphers - A History of Cryptography by Alexander D'Agapeyeff (reprinted 2013)
2. The Kids' Code and Cipher Book (Holt Owlet) Nancy Garden (1981)
3. Codes and Ciphers - A History of Cryptography by Alexander D'Agapeyeff (reprinted 2013)