我有一些数据，我想在ASP.NET MVC应用程序，以prevent用户篡改数据加密。我可以使用加密类来完成实际的加密/解密，没问题的。主要的问题是搞清楚在哪里存储加密密钥和管理更改。

I have some data I want to encrypt in an ASP.NET MVC application to prevent users from tampering with it. I can use the Cryptography classes to do the actual encryption/decryption, no problem there. The main problem is figuring out where to store the encryption key and managing changes to it.

由于ASP.NET已经保持对各种事物的machineKey（ViewData的加密等），我在想，如果有这让我加密/使用的machineKey解密自己数据的任何ASP.NET的功能呢？这样，我就不会去制定自己的密钥管理系统。

Since ASP.NET already maintains a machineKey for various things (ViewData encryption, etc), I was wondering if there were any ASP.NET functions which let me encrypt/decrypt my own data using the machineKey? This way I would not have to devise my own key management system.

推荐答案

新的在ASP.NET 4.0的machineKey 类不正是你想要的。

The new MachineKey class in ASP.NET 4.0 does exactly what you want.

例如：

public static class StringEncryptor {
    public static string Encrypt(string plaintextValue) {
        var plaintextBytes = Encoding.UTF8.GetBytes(plaintextValue);
        return MachineKey.Encode(plaintextBytes, MachineKeyProtection.All);
    }

    public static string Decrypt(string encryptedValue) {
        try {
            var decryptedBytes = MachineKey.Decode(encryptedValue, MachineKeyProtection.All);
            return Encoding.UTF8.GetString(decryptedBytes);
        }
        catch {
            return null;
        }
    }
}

更新：正如here,小心你如何使用，或者你可以让别人伪造一个窗体身份验证令牌。

UPDATE: As mentioned here, be careful how you use this or you could allow someone to forge a forms authentication token.