Peter- I am honored. Whit has spoken highly about you to me. ...and thank you for your responses.
"discern" was the primary concern through sram imprinting accelerated by radiation (https://ttu-ir.tdl.org/ttu-ir/handle/2346/58641 ) "affect" is how I might implement a free, high dose gamma ray detector. ...but I certainly defer to your much greater expertise in this area and eagerly await more knowledge. Great to hear the bit-flipping defense will probably not cause any IPR headaches. Thank you, -Rick ---------- Forwarded message ---------- From: Peter Gutmann <[email protected]> Date: Wed, Jun 29, 2016 at 8:38 AM Subject: RE: [FORGED] [Cryptech Tech] Fwd: Status tamper detection and MKM erasure (low dose gamma ray) To: Richard Lamb <[email protected]>, "[email protected]" <[email protected]> Richard Lamb <[email protected]> writes: >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. Do you mean "discern" or "affect"? Ionizing radiation will cause single-event upsets, which is disastrous for non-hardened crypto (as well as permanent damage from things like neutrons, but that's more detectable), but how do you discern memory states with it? >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. I wrote about bit-flipping defences in the late 1990s, and I believe it was used before then but not talked about much, so either the patents will be close to expiring or there's prior art for them. Peter.
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