How can I increase memory security in Delphi?

Question

Is it possible to \"wipe\" strings in Delphi? Let me explain:

I am writing an application that will include a DLL to authorise users. It will read an encrypted file

Answer 1

How about decrypting the file to a stream, using a SAX processor instead of an XML DOM to do your verification and then overwriting the decrypted stream before freeing it?