Wow, this sounds really convoluted, but might work...

But this seems to be largely a waste of time and effort, because, as lots of people are trying to tell you above, the problem is "where is the weakest part of the security"? It's not the system, or it's memory. It's on the network itself. A sniffer can easily capture a clear text password. Until clear text passwords are done away with, the scripts' system's memory is (very likely) not worth worrying about.

OP, there are lots of guesses going on above about why you are worrying about a core dump scenario, could you enlighten us as to your actual reasons?

-Scott