Cryptography Fundamentals

🎯 Learning Objectives

• Understand the difference between encoding, hashing, and encryption
• Learn about symmetric and asymmetric encryption
• Implement secure password hashing
• Work with digital signatures and certificates
• Apply cryptography in practical scenarios

🔐 Cryptography Basics

Cryptography is the practice and study of techniques for secure communication.

#️⃣ Hashing

Hashing converts data into a fixed-size output. It's one-way - you can't reverse it.

🔑 Symmetric Encryption

Same key is used for encryption and decryption. Fast and efficient.

🔐 Asymmetric Encryption

Uses key pair - public key for encryption, private key for decryption.

✍️ Digital Signatures

Digital signatures provide authentication, integrity, and non-repudiation.

🔒 TLS/SSL

TLS (Transport Layer Security) secures communications over networks.

📝 Summary