Hi Cabe,
Potting is indeed a nice way of making a circuit diagram less visible. But be aware that, as all materials suffer from thermal expansion you might destroy components under normal use. A nice example is ferrite in Epoxy resin. So, use materials that match the expension of the components used.
I would say: add a microcontroller and protect the firmware from reading. That is really the ultimite black box. What you can also do (for larger product quantities) is asking an chip supplier to mark the chip with a decicated codenumber (datasheet will not be traceble). If the reverse engineer has knowlegde about the type of circuit used he could figure out what controller is used anyway (but it will take a lot of extra time). Add extra layers in a pcb is also interesting, but you can sand down the pcb and computer scan the layers. Mark the layer with a color and paste all layer on top of each other on the computer to make the electrical routing visible from layer to layer. You see: reverse engineering is always possible. :-)
Best regards,
Enrico Migchels
Enrico,
Thank you, those are good suggestions. Some designs I have are not microcontroller based, so I was looking for a way to protect that too.
A determined person will break any security. I just want to make it harder to do and stop the casual thief.
Cabe
Enrico,
Thank you, those are good suggestions. Some designs I have are not microcontroller based, so I was looking for a way to protect that too.
A determined person will break any security. I just want to make it harder to do and stop the casual thief.
Cabe