实现了简单的加密解密功能。

填写密钥，可以对文本文件和图片(其他文件没有测试)进行覆盖加密，

密钥相同再执行run，可以实现对加密文件的解密

-To achieve a simple encryption and decryption functions. Fill in the key, you can text and images (the other paper did not test) to cover encryption key and then the implementation of the same run, you can achieve decrypt encrypted files