Decrypt given data previously encoded with aria-256-ecb cipher algo. ARIA with a 256-bit key in ECB (Electronic Codebook) mode. A basic mode of ARIA, commonly used in academic settings. Not recommended due to vulnerability to pattern attacks. Our decryption process assumes the IV string is prepended in the encoded string during the encryption process. You can not decrypt and get the correct results if the IV or passphrase mismatch occurs between encryption and decryption process.