Real-World Cryptography

4 Authenticated encryption

This chapter covers

• Symmetric encryption vs. authenticated encryption
• Popular authenticated encryption algorithms
• Other types of symmetric encryption

Confidentiality is about hiding data from unwanted eyes and encryption is the way to achieve this. Encryption is what the science of cryptography was initially invented for; it’s what preoccupied most of the early cryptographers. They would ask themselves, “How can we prevent observers from understanding our conversations?” While the science and its advances first bloomed behind closed doors, benefiting the governments and their militaries only, it is now opened throughout the world. Today, encryption is used everywhere to add privacy and security in the different ...