Decrypt given data previously encoded with aes-128-cfb cipher algo. AES-128 in Cipher Feedback mode. A stream cipher mode that allows encryption of smaller increments. Secure but susceptible to bit-flipping 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.