Anti Cheat Tool (For protection against memory hackers)

/* ********************** Anti Cheat tool (for memory hackers only) ********************** */
/* *********************************** Jamius Siam *************************************** */

/// <summary>
/// Anti Cheat Tool's API.
/// </summary>
public sealed class ACT
{

    public static char[] key = new char[10]{'q','w','e','r','t','y','u','i','o','p'};            //Key for encryption (can change it as you wish, but make sure not to repeat an alphabet)
    static char[] orgKey = new char[]{'0','1','2','3','4','5','6','7','8','9'};                 // Key for decryption



    public static string Encrypt (int inputInt)                                             // Method for Encrypting given Int to random string
    {
        string mainWord = inputInt.ToString ();
        char [] testWord = new char[mainWord.Length];
        testWord = mainWord.ToCharArray ();
        char[] output = new char[testWord.Length];

        for (int x = 0; x < testWord.Length; x++) {
            int map = (testWord [x]) - '0';
            output [x] = key [map];
        }

        string abs = new string (output);
        return(abs);
    }



    public static int Decrypt (string inputString)                                                  // Method for Decrypting given random string to int
    {
        char [] testWord = new char[inputString.Length];
        testWord = inputString.ToCharArray ();
        char[] output = new char[testWord.Length];

        for (int x = 0; x < testWord.Length; x++) {
            int map = 0;
            for (int y = 0; y < key.Length; y++) {
                if (key [y] == testWord [x])
                    map = y;
            }
            output [x] = orgKey [map];
        }

        string abs = new string (output);
        int returnValue = int.Parse (abs);
        return(returnValue);
    }



    public static string Add (string a, string b)                                           // Method for adding two encryted strings together (string input)
    {
        int A = Decrypt (a);
        int B = Decrypt (b);


        string sum = Encrypt (A + B);
        return sum;
    }



    public static string Add (int a, int b)                                                 // Method for adding two encryted strings together (int input)
    {
        string sum = Encrypt (a + b);
        return sum;
    }



    public static string Subtract (string a, string b)                                      // Method for subtracting two encryted strings together (string input)
    {
        int A = Decrypt (a);
        int B = Decrypt (b);

        string sum = Encrypt (A - B);
        return sum;
    }


    public static string Subtract (int a, int b)                                            // Method for subtracting two encryted strings together (int input)
    {
        string sum = Encrypt (a - b);
        return sum;
    }


    public static string Multiply (string a, string b)                                      // Method for multiplying two encryted strings together (string input)
    {
        int A = Decrypt (a);
        int B = Decrypt (b);

        string sum = Encrypt (A * B);
        return sum;
    }



    public static string Multiply (int a, int b)                                            // Method for multiplying two encryted strings together (int input)
    {
        string sum = Encrypt (a * b);
        return sum;
    }


    public static string Divide (string a, string b)                                        // Method for multiplying two encryted strings together (string input)
    {
        int A = Decrypt (a);
        int B = Decrypt (b);

        string sum = Encrypt (A / B);
        return sum;
    }


    public static string Divide (int a, int b)                                          // Method for multiplying two encryted strings together (int input)
    {
        string sum = Encrypt (a / b);
        return sum;
    }
}