AES decryption reverses ciphertext back into plaintext using the same key. Security implication:
If the key is lost, data is effectively unrecoverable. If the key is stolen, encryption provides no protection. Try it (demo):
- Paste the ciphertext from AES encryption
- Paste the exact same key
- Decrypt to restore the original plaintext
- Change one character of the key and try again (it should fail or produce garbage)