C#加解密文件，可以自己创建私有密钥对文件进行加密与解密，IO对称加解密操作，强度很高，无私钥与解密算法情况下可逆性几乎为零。。VS2003/VS2005下编译通过-C# file encryption and decryption, you can create your own private key to encrypt and decrypt files, IO symmetric encryption and decrypti