import crypto ct = crypto.base64_to_str(open('data/10.txt', 'r').read()) key = "YELLOW SUBMARINE" iv = '\x00' * 16 # Decrypt pt = crypto.aes_decrypt_cbc(ct, key, iv) print pt # Re-encrypt new_ct = crypto.aes_encrypt_cbc(pt, key, iv) if ct == new_ct: print "Success!" else: print "Encryption/Decryption failed!"