Classical Cryptography

Classical cryptography refers to historical encryption techniques used before the advent of computers, primarily based on manual or mechanical methods to secure communication. It includes ciphers like substitution, transposition, and polyalphabetic systems, such as the Caesar cipher, Vigenère cipher, and Enigma machine. These methods focus on obscuring plaintext through mathematical or algorithmic transformations without relying on digital technology.

Also known as: Historical Cryptography, Pre-computer Cryptography, Traditional Ciphers, Manual Encryption, Ancient Cryptography

Why learn Classical Cryptography?

Developers should learn classical cryptography to understand the foundational principles of encryption, which inform modern cryptographic algorithms and security practices. It is essential for those working in cybersecurity, cryptography research, or historical analysis of secure systems, as it provides context for the evolution of encryption techniques. Knowledge of classical ciphers helps in recognizing vulnerabilities and designing robust security protocols in contemporary applications.

Learning Resources

• course: Cryptography I - Stanford University (Coursera)
• book: The Code Book by Simon Singh
• tutorial: Classical Cryptography - Khan Academy
• docs: Cryptography - Wikipedia
• video: Introduction to Cryptography - YouTube (Computerphile)