Application of Number: Codes and Public Key Cryptography

Secret codes, or ciphers as they are known in the trade, are one thing guaranteed to capture the imagination of people, especially children. As a child there seems to be little that you have all your own that adults cannot gain access to and take away if they choose. Having your own way of communicating with one or two trusted friends that no-one else can understand gives little ones a rare chance to walk tall, and feel superior in a world not even parents can enter.