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Symmetric-key
AES-GCM encrypt & decrypt
Encrypt a real message with real AES-256-GCM, see the IV, ciphertext, and auth tag, then decrypt it back — or tamper with one byte and watch decryption fail.
What's happening under the hood →·Read the Symmetric-key cryptography & AES module for the full explanation →
1. Generate a key
A random 256-bit AES key, generated in your browser and never sent anywhere.
2. Encrypt a message
3. Decrypt it back