Joanna Bourne, author of the new Rogue Spy, joins HEA to share how spies communicated back in the day. Joanna: Do I love cryptography and codes because I write about Regency spies? Or do I write about ...

The message is called the plaintext because it is the unchanged source information. Example: The cat ran away. The secret message generated is called a cipher or ciphertext and it is the encrypted ...

Ever since writing has existed, people have wanted to send secret messages to one another--and others have wanted to intercept and read them. This is the second installment of a blog series taking you ...