- Encoding transforms data format for usability without secret keys.
- Encryption protects secrecy using secret keys.
- Hashing generates a deterministic, fixed-size representation that cannot be reversed.
### Clearing Common Confusions
Beginners often confuse **Encoding**, **Encryption**, and **Hashing**. Here is the distinction:
| Concept | Secret Key Needed? | Reversible? | Primary Purpose |
| :--- | :--- | :--- | :--- |
| **Encoding** (e.g., Base64) | No | Yes | Data compatibility & transfer |
| **Encryption** (e.g., AES) | Yes | Yes (with key) | Confidentiality |
| **Hashing** (e.g., SHA-256) | No | No (One-way) | Integrity verification |
Never use Base64 encoding as a security mechanism! Base64 carries zero confidentiality.