ECC Curves: secp256k1 versus secp521r1 -> BitMessage Secure Station

BM-2cWZW87PJN5VZjtJCpk3hXcYefhNCxdjU6
Jul 16 22:18

I agree. Super well written post. I'll add my two cents for the BitMessage Secure Station : And YES, he reminds us (or teaches us) that in cyber-security in general (Including crypto), what we call secure is always based on unproven initial assumptions. For those who read my post ( here: https://blogs.mediapart.fr/stman/blog/090717/torvpn-fingerprinting-family-anonymity-breach-fix-custom-fpga-based-ic ) about the "Tricks" I use to "neutralize" potential FPGA hardware backdoors in the BitMessage Secure Station, it is again made on initial assumptions. But they are never prooven in the way that these assumptions may be indeed partially false, or incomplete. So when we declare a problem solved, it's always in a very strict context. For folks interested in my work, my initial assumptions for my current solution is based on the following assumption in my post : "FPGA Hardware backdoor are a kind remotely controllable JTAG Circuitry through dedicated hidden/side channels, and those side/hidden channels are 'listening' for their data on all IOB's (Input/Output pins) of the FPGA" In order to reach better levels of security, one has to make assumptions more constraining, and check if the solution still work... In my case, it would correspond to adding to the initial assumptions : "... or on all inputs and outputs of all the CLB's (Configurable logic blocks) of the FPGA" Which I did and all my tricks still work, except one I have to rework, but it's done, I just need to correct the text in the post... I'll do it this week. If some reading these lines think it is necessary to add other something in the assumptions made in my work, please do ! Let me know ! It is fucking important.

[chan] bitmessage
BM-2cWy7cvHoq3f1rYMerRJp8PT653jjSuEdY

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