GCM & Authenticated Encryption
Add authentication tags to encryption to prevent tampering.
Welcome
AES-GCM is the gold standard for authenticated encryption. It provides confidentiality AND integrity in one operation, preventing tampering without a separate HMAC step.
The Problem with Encryption Alone
Encryption provides confidentiality but NOT integrity. An attacker intercepting AES-CBC ciphertext can flip bits and change the decrypted plaintext without knowing the key.
All lessons in this course
- Block Cipher Fundamentals & Padding
- ECB vs CBC: Patterns & IVs
- CTR Mode & Stream-Cipher Behavior
- GCM & Authenticated Encryption