using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        string data = "{ hideSplash: true, hideToolbarAdvertisingButtons: true, hideToolbarLogo: true, customAppTitle: \"MyProductTitle\" }";

        string encrypted = Encrypt(data, "5&8%XtcpPsH%");

        Console.WriteLine("Encrypted: " + encrypted);

        Console.WriteLine();

        string decrypted = Decrypt(encrypted, "5&8%XtcpPsH%");  

        Console.WriteLine("Decrypted: " + decrypted);

    }

    static string Encrypt(string text, string key)

    {

        StringBuilder result = new StringBuilder();

​

        for (int c = 0; c < text.Length; c++)

            result.Append((char) ((uint) text[c] ^ (uint) key[c % key.Length]));

​

        byte[] bytes = Encoding.UTF8.GetBytes(result.ToString());

​

        return Convert.ToBase64String(bytes);

    }

​

    static string Decrypt(string text, string key)

    {

        byte[] bytes = Convert.FromBase64String(text);

        string s = Encoding.UTF8.GetString(bytes);

​

        StringBuilder result = new StringBuilder();

​

        for (int c = 0; c < s.Length; c++)

            result.Append((char) ((uint) s[c] ^ (uint) key[c % key.Length]));

​

        return result.ToString();

    }

}