Understanding Symmetric Encryption: The Fundamentals of Classical Cryptography

Chapter 2 covers classical encryption techniques, focusing on symmetric encryption, also known as private-key encryption. It explains how the sender and recipient share a common key for both encryption and decryption. This method was the only type of encryption prior to the development of public-key encryption in the 1970s and remains the most widely used. Essential terminology is introduced, including plaintext, which refers to the original message before encryption. Understanding these concepts is crucial for grasping the foundations of computer security and data protection.