Introduction If you need to send a secret message to a friend, how could you prevent other people from reading it? One way is to encrypt the message—that is, use a secret code that only you and your ...

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

We seem to have an instinctive fascination for mysteries and, especially, for mysteries that revolve around secret codes. This penchant brought about a publishing sensation in 2003-Dan Brown's novel ...

We seem to have an instinctive fascination for mysteries and, especially, for mysteries that revolve around secret codes. This penchant brought about a publishing sensation in 2003-Dan Brown's novel ...