Unlocking the Secrets of Cryptography: How Your Data Stays Safe 🔐

Welcome to TechTalk Education! In this video, we explore how cryptography actually works — from symmetric encryption to the powerful RSA algorithm. Whether you're new to tech or looking to solidify your understanding, this episode simplifies the math and logic behind cryptography without heavy formulas.

✅ Topics covered:

What is encryption?
- Symmetric vs. asymmetric cryptography
- How RSA works with prime numbers
- The role of public and private keys
- Real-world uses: HTTPS, VPNs, messaging apps
- The Extended Euclidean Algorithm (visually explained!)

We use visuals, analogies, and real examples to make cryptography click for anyone — from curious learners to budding cybersecurity pros.

🔐 Perfect for:
- IT students
- Home-schooled learners
- Security enthusiasts
- Educators teaching cryptography basics
- Anyone asking “What is RSA?” or “How do encryption keys work?”

The No Starch Press book entitled "The Manga Guide to Cryptography" is available here: https://nostarch.com/mangacrypto
00:00 Introduction
01:05 Intro
02:27 What Is Cryptography?
02:59 Symmetric Encryption
04:05 Symmetric Encryption Uses
04:39 Caesar Cipher
05:12 Assymetric Encryption
06:30 Who Is RSA?
09:06 Use Very Large Prime Numbers
10:14 Euler's Totient Function
13:43 The Modulus
17:15 Extended Euclidian Algorithm (EEA)
19:00 Computing Private Exponent d
20:35 Dividing A Multiplicative Inverse
21:16 Euclid Division
25:07 Determining If An Inverse Exists
26:06 Backtracking Through The Previous Steps
28:00 Still Looking For The Decrypt Value d
28:56 The Result!!
29:22 Computing The Inverse
31:20 Deriving The Public & Private Keys
32:28 Decrypting the Message