Possibly, the earliest known cryptogram (or substitution cipher) is the Caesar Cipher, supposed to have been used by Julius Caesar. Possibly, the earliest known cryptogram (or substitution cipher) is ...

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 ...

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 ...