using System;

using System.Security;

using  static System.Runtime.InteropServices.Marshal;

​

public class Program

{

    public static void Main()

    {

        //Creating a Secure String

        SecureString secStr = new SecureString();

        foreach (Char ch in "Camilo".ToCharArray()) { secStr.AppendChar(ch); }

        //Reading a Secure String

        IntPtr pointer1 = SecureStringToBSTR(secStr);

        IntPtr pointer2 =  SecureStringToGlobalAllocUnicode(secStr); //copies the secure string content to unmanaged memory

        string str1 = PtrToStringUni(pointer1);

        string str2 = PtrToStringUni(pointer2);     

        Console.WriteLine("Cyphered String: "+secStr.ToString());

        Console.WriteLine("Decyphered String: "+str1);  

        Console.WriteLine("Unmanaged Ptr: "+ str2);

        ZeroFreeGlobalAllocUnicode(pointer2);

        secStr.Dispose();       

    }

}