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backside:start [2018/02/20 21:25] – mcmaster | backside:start [2018/02/20 21:54] – mcmaster | ||
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- | Backside analysis can include: | + | {{: |
* Imaging transistor layout without delayering | * Imaging transistor layout without delayering | ||
* Imaging transistor activity using PMT, camera, etc for side channnel analysis | * Imaging transistor activity using PMT, camera, etc for side channnel analysis | ||
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====== Camera ====== | ====== Camera ====== | ||
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+ | mcmaster: I bought an MU800 with the intention of removing the IR filter. I also might put silicon wafer in the imaging path to filter out the visible light. Unclear if my microscope optics can pass the IR light, say, even the relay lens. But I suppose if they have an IR filter it must pass some? | ||
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+ | Ordering some IR lasers | ||
===== Sample commercial unit ===== | ===== Sample commercial unit ===== | ||
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====== Optical fault injection ====== | ====== Optical fault injection ====== | ||
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+ | Basic idea: change how the circuit switches current in order to introduce a glitch. For a combinitorial circuit you probably want a CW laser to keep the glitch active. If its a CPU, you probably want a pulsed laser to trigger the glitch for a short period of time | ||
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+ | Above: " | ||
In its simplest form, a CSP can be strobed with a camera flash | In its simplest form, a CSP can be strobed with a camera flash | ||
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[[https:// | [[https:// | ||
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+ | Above: silicon transmission marked with bandgap and for 980 nm laser (commonly available) | ||
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+ | Possible sources: | ||
+ | * Photo flash, such as with mask | ||
+ | * 980 nm laser will have high attenuation (roughly 2% transmittance), | ||
+ | * Specifically? | ||
+ | * 1065 nm (ie 1064 nm from Nd:YAG) and such is probably ideal | ||
+ | * Must Nd:YAG are flashlamp pumped | ||
+ | * Depending on glitch target might want either flashlamp or diode pumped | ||
[[https:// | [[https:// | ||
- | Solutions | + | Commercial solutions |
* [[http:// | * [[http:// | ||
* [[https:// | * [[https:// | ||
- | * ChipWispherer | + | * ChipWhispherer |