Encrypt given data using 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 encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.