Decrypt given data previously encoded with des-cbc cipher algo. DES in CBC (Cipher Block Chaining) mode, where each block is XOR'd with the previous ciphertext block before encryption. DES in CBC mode was one of the most commonly used encryption methods for decades, offering better security than ECB. CBC mode improves upon DES, but DES itself is now considered insecure due to its short key length. 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.