A code transforms information. A cipher transforms information for the purpose of secrecy.
The Caesar Cipher is a code and a cipher.
The Magic Marker System is a code, but not a cipher.
Binary is also a code, and not a cipher... unless of course you are using it to communicate with another programmer, in a room full of non-programmers, to ensure the secrecy of your message. In which case, you are using binary as a cipher.
The front cover claims the book contains "Da Vinci style codes and ciphers". But if a cipher is written "to be cracked!" is it actually a cipher? Can this book contain any ciphers at all, if they are designed to be solved?
