AESUnlocker

AES na a symmetric cipher, so di same key na used for both encryption and decryption. During decryption,the key must match di encryption key exactly; even a one-character difference go cause failure or unreadable output.

The secret key must remain confidential. Anyone who has di key fit decrypt di data, and if di key na lost, di encrypted content may be impossible to recover.

The IV or nonce must match di value used during encryption exactly, otherwise di decrypted result go be invalid. CBC and CTR use a 16-byte IV (32 hex characters), while GCM uses a 12-byte nonce (24 hex characters).

The IV normally travels with di ciphertext and does not need to stay secret, but if it na missing, proper decryption na no longer possible.

The mode selected here must be identical to di one used during encryption, otherwise decryption go fail or produce unreadable output.

CBCna a common block mode dat requires an IV.CTRbehaves more like a stream and na fast for large data.GCMadds integrity checks, so tampered ciphertext fails immediately.

Key size determines di AES round count, and encryption and decryption must use di same key length.

If di wrong key size na selected, key import fails immediately because di key length no longer matches di chosen AES variant.

After decryption, di tool removes padding according to di selected scheme. If di padding mode na wrong, di output may end with garbage bytes or fail entirely.

PKCS#7na di most common choice and removes padding precisely.Zero Paddingtrims trailing00bytes and na only safe when di original length na known.

The encryption tool outputs encoded text ciphertext. To decrypt it correctly, choose di same encoding so di browser fit rebuild di original bytes before running AES decryption.

Base64uses letters, numbers, and+/=, often with trailing padding.Hexuses0-9anda-fwith two characters per byte. If you upload a binary .enc file, di encoding choice na ignored automatically.