Re: Avoid copy Eprom.
- From: Peter Jakacki <peterjak@xxxxxxxxxx>
- Date: Fri, 10 Jun 2005 08:51:45 +1000
Eric Smith wrote:
sangleen@xxxxxxxxxxx writes:
I have program in an Eprom 27C256, and I want avoid copies of this Eprom. Is there a way to disable coping?
Yes. If you break the pins off the package, it will be much more difficult for someone to copy it.
LOL! The only answer so far that has gotten close to answering the OP's question directly. No amount of encryption or obfuscation can protect an Eprom from being copied, as every bit of every byte is accessible. Just as photos cannot be copy protected as anyone can run them through a scanner etc. But I think that the OP should really of asked "how do I make it harder to for someone to make a working copy of my system" or suchlike.
The answer lies in adding an extra bit of hardware and having the program verify it. What comes to mind is a suitably programmed secure micro in an small package that can easily be added to the system, perhaps through a single I/O pin. It could even be powered from the same pin! The program needs to verify that the device is attached and that it's response meets the challenge given.
So yes, the Eprom can still be copied but it won't work unless they crack the secure device or the Eprom code and overcome the basic security measure. But that's work they mightn't be up to hopefully.
my2cents *Peter* .
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