多年后，我回来对他们说:不要这样做!看XOR加密有什么问题?获取详细信息。

一种非常简单的双向加密是异或加密。

Come up with a password. Let's have it be mypass. Convert the password into binary (according to ASCII). The password becomes 01101101 01111001 01110000 01100001 01110011 01110011. Take the message you want to encode. Convert that into binary, also. Look at the length of the message. If the message length is 400 bytes, turn the password into a 400 byte string by repeating it over and over again. It would become 01101101 01111001 01110000 01100001 01110011 01110011 01101101 01111001 01110000 01100001 01110011 01110011 01101101 01111001 01110000 01100001 01110011 01110011... (or mypassmypassmypass...) XOR the message with the long password. Send the result. Another time, XOR the encrypted message with the same password (mypassmypassmypass...). There's your message!

是，添加系统。安全程序集，导入System.Security.Cryptography名称空间。这是一个简单的对称(DES)算法加密的例子:

DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.GenerateKey();
byte[] key = des.Key; // save this!

ICryptoTransform encryptor = des.CreateEncryptor();
// encrypt
byte[] enc = encryptor.TransformFinalBlock(new byte[] { 1, 2, 3, 4 }, 0, 4);

ICryptoTransform decryptor = des.CreateDecryptor();

// decrypt
byte[] originalAgain = decryptor.TransformFinalBlock(enc, 0, enc.Length);
Debug.Assert(originalAgain[0] == 1);

在System.Security.Cryptography中使用TripleDESCryptoServiceProvider:

public static class CryptoHelper
{
    private const string Key = "MyHashString";
    private static TripleDESCryptoServiceProvider GetCryproProvider()
    {
        var md5 = new MD5CryptoServiceProvider();
        var key = md5.ComputeHash(Encoding.UTF8.GetBytes(Key));
        return new TripleDESCryptoServiceProvider() { Key = key, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 };
    }

    public static string Encrypt(string plainString)
    {
        var data = Encoding.UTF8.GetBytes(plainString);
        var tripleDes = GetCryproProvider();
        var transform = tripleDes.CreateEncryptor();
        var resultsByteArray = transform.TransformFinalBlock(data, 0, data.Length);
        return Convert.ToBase64String(resultsByteArray);
    }

    public static string Decrypt(string encryptedString)
    {
        var data = Convert.FromBase64String(encryptedString);
        var tripleDes = GetCryproProvider();
        var transform = tripleDes.CreateDecryptor();
        var resultsByteArray = transform.TransformFinalBlock(data, 0, data.Length);
        return Encoding.UTF8.GetString(resultsByteArray);
    }
}

命名空间System.Security.Cryptography包含TripleDESCryptoServiceProvider类和RijndaelManaged类

不要忘记添加对系统的引用。安全大会。

我想发布我的解决方案，因为上面的解决方案都不像我的那么简单。让我知道你的想法:

 // This will return an encrypted string based on the unencrypted parameter
 public static string Encrypt(this string DecryptedValue)
 {
      HttpServerUtility.UrlTokenEncode(MachineKey.Protect(Encoding.UTF8.GetBytes(DecryptedValue.Trim())));
 }

 // This will return an unencrypted string based on the parameter
 public static string Decrypt(this string EncryptedValue)
 {
      Encoding.UTF8.GetString(MachineKey.Unprotect(HttpServerUtility.UrlTokenDecode(EncryptedValue)));
 }

可选

这里假设用于加密该值的服务器的MachineKey与用于解密该值的MachineKey相同。如果需要，您可以在Web中指定一个静态MachineKey。配置，使您的应用程序可以解密/加密数据，而不管它在哪里运行(例如开发还是生产服务器)。您可以按照这些说明生成一个静态机器密钥。

我知道你说过你不关心它有多安全，但如果你选择DES，你也可以选择AES，这是最新的加密方法。