Decrypt given data previously encoded with des-ecb cipher algo. DES in ECB (Electronic Codebook) mode, where each block is encrypted independently. ECB was one of the earliest modes used with DES, known for its simplicity but vulnerable to block repetition attacks. DES-ECB is insecure and should not be used in modern cryptographic systems. 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.