To tell a secret, and keep it too Part of communicating is trying to tell someone something without the wrong someone hearing it. We take a look at the history and practice of secret messages. And here’s our latest attempt at Episode One. Take 106 of Episode One: Don't know where to begin Here’s a timeline of cryptography. History of encryption (cryptography timeline) Here’s a video on the basics of public and private key encryption. Encryption and public keys And here’s a site on the history of encryption. History of encryption