AES-256 Text Encryption — How It Works

AES (Advanced Encryption Standard) is a symmetric-key block cipher adopted by the US National Institute of Standards and Technology (NIST) in 2001. "AES-256" refers to a 256-bit key length, providing 2²⁵⁶ possible keys — computationally infeasible to brute-force with any known hardware.

Symmetric encryption means the same secret key is used for both encryption and decryption, unlike asymmetric systems (RSA) where a public key encrypts and a private key decrypts.

Use Cases

• Encrypting database connection strings before sharing over Slack
• Securing API keys in plain-text configuration files
• Protecting sensitive notes shared over email

FAQ

What happens if I forget the key? The cipher is mathematically irreversible without the exact key. There is no recovery mechanism — treat the key like a password.

Is this safe enough for medical/financial data? For production-grade security, use a dedicated library (e.g., Web Crypto API with PBKDF2 key derivation). This tool is designed for educational use and lightweight string protection.