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  1. joaomartins

    Envelope penetration detection

    Hi Heydave, I have two questions: 1) The C is not temperature and pressure dependent? 2) "The AC signals from the micro, used to test the capacitance/resistance, would vary with time according to a randomization..." why is random necessary?
  2. joaomartins

    Envelope penetration detection

    "How about randomly chop up chunks of encrypted data and store them in different physical RAM's? " I believe that the uP does this! By encrypting the addresses you do not know where is the vector table for instance. "but I think you should use a box inside a box approach where...
  3. joaomartins

    Envelope penetration detection

    Again thanks for your comments: The uP DS5002 does BUS encryption and the CODE and DATA store are encrypted. And yes, different boards will have different encryption keys on the uC. I need a PCB board that can run security algorithms and keep security keys inside. This can be used for...
  4. joaomartins

    Envelope penetration detection

    First thanks for all comments/suggestions Warpspeed: Nice idea but I have the problem that the SRAM will have DATA as well as CODE! This means that I can not change data lines and I must be carefully with Addr lines change. Even if I change some addr lines is not relevant because it is just a...
  5. joaomartins

    Envelope penetration detection

    I use DS5002 from Dallas which has BUS encryption. In the SRAM there are security KEYS that I must protect. Even encrypted with some effort it can be broken. The idea of using some special enclosure is at least to increase the time for the attack as much as possible. About the money that I can...
  6. joaomartins

    Envelope penetration detection

    I believe I am was unable to explain correctly my problem. What I need is something to protect SRAM critical data and not to protect reverse engineering! Basically I need to know when a penetration happens and then short the VCC-GND SRAM pins. "For example, if the circuit card itself were...
  7. joaomartins

    Protel to ProEngineer?

    I usually do the following: 1. Create one PCB empty 2. Import Top layer Overlay gerber and top pad (I think because I do not remember now which one has the holes description) 3. Delete what I do not need to avoid having too much information on the DXF 4. Export as top.DXF 5. Repeat the process...
  8. joaomartins

    Envelope penetration detection

    Thanks for your answers. 1) Both talk about EPOXY. This is nice but I have seen EPOXY being removed without damaging the board! How can I real make a part susceptible to etch!? 2) "How about a seald box with positive pressure" The box can not be completed sealed because I need to...
  9. joaomartins

    Envelope penetration detection

    Hi, I have one PCB with electronics that I want to protect from ouside world probing! I use on Flat for the interface. I am considering the use of a sheet to enclose the PCB. It would be great to measure the tin sheet and if some hole is made on it this resistance measurent should be...

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