Security+ Training Course Index: Professor Messer’s Course Notes: Frequently Asked Questions: - - - - - Our modern applications make extensive use of cryptography. In this video, you’ll learn the basics of cryptography and some of the history of ciphers and secrecy. - - - - - Download entire video course: Get the course on MP3 audio: Subscribe to get the latest videos: Calendar of live events: FOLLOW PROFESSOR MESSER: Professor Messer official website: Twitter: Facebook: Instagram: Google +: