Symmetric Encryption Concepts
Understand shared-key encryption, key sizes, and block vs stream ciphers.
Welcome
Symmetric encryption uses one key for both encryption and decryption. In this lesson we build the concepts before diving into AES internals.
Shared Key Model
Alice and Bob share a secret key K. Alice encrypts: C = Enc(K, P). Bob decrypts: P = Dec(K, C). Eve intercepts C but without K cannot recover P.
All lessons in this course
- Symmetric Encryption Concepts
- AES Structure: Rounds & State Matrix
- AES Key Expansion & Key Sizes
- Encrypting Files with AES in Practice