Decrypt given data previously encoded with aes-128-ocb cipher algo. AES-128 in Offset Codebook Mode. An authenticated encryption mode with low overhead and parallelizability. Secure but not widely adopted due to patent concerns. 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.