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 keeping the password as a hash value in the XML and verify by comparing the hash of the input password with the hashed password in your XML.

Edit: You can keep all the sensitive data encrypted and decrypt only at the last possible moment.