Non usare stringhe normali.

In C# pensavo a qualcosa del genere ...

codice:
using System;
using System.Security;
using System.Runtime.InteropServices;

public class Example
{
    static private SecureString accsec;
        
    static private void cripto()
    {
        accsec = new SecureString();
        accsec.AppendChar('P');
        accsec.AppendChar('A');
        accsec.AppendChar('S');
        accsec.AppendChar('S');
        accsec.AppendChar('W');
        accsec.AppendChar('O');
        accsec.AppendChar('R');
        accsec.AppendChar('D');
    }

    public static void Main()
    {
        cripto();

        IntPtr bstr = Marshal.SecureStringToBSTR(accsec);

        try
        {
            Console.WriteLine(Marshal.PtrToStringBSTR(bstr));
        }
        finally
        {
            Marshal.FreeBSTR(bstr);
        }
    }
}