Master Substitution Techniques in Cryptography: Caesar, Mono & Polyalphabetic, Playfair 🕵️‍♂️

💡 How did ancient civilizations protect their secrets?

In this video, we break down the powerful and clever substitution techniques in cryptography — the earliest forms of secret writing that shaped the future of digital security. From Caesar Cipher to Playfair and Monoalphabetic Substitution, Polyalphabetic Substitution .you’ll explore how letters were encrypted, how these ciphers worked, and where they’re still relevant today.

🚀 Whether you’re a computer science student, preparing for exams, or just curious about encryption history, this is your complete guide to substitution ciphers with step-by-step examples and real-world applications.

🔑 Topics Covered:
• Caesar Cipher (Shift Cipher)
• Monoalphabetic Substitution
• Polyalphabetic Substitution
• Playfair Cipher
• Strengths and Weaknesses of Substitution Methods

➕ Learn the logic behind the codes and understand how they influenced modern encryption systems like AES and RSA.

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