Pardon me if this has already been discussed but in my own commercial HSM development efforts I have ran across a relatively simple but effective protection against attempts to discern memory states using low dose gamma rays such as those from a lab Co-60 source. Simply inverting the bits of the MKM every tenth of a second or so may be effective. Even with X,gamma, etc detectors built into my HSM, distinction between high dose and low dose is a difficult task given unknown deployment environments. Hence this suggestion.
Again, I apologize if this has been discussed already. -Rick Lamb PS: Only caveat I would point out is this bit flipping has also been used in the standard tamper detection chip used by many HSM vendors (Dallas semi.. I need to look up number). So it may be fall under some IPR from that chip maker.
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