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Link? The private key stays on the secure element

• lxgr 4y ago
  From https://docs.foundationdevices.com/en/faqs https://docs.foundationdevices.com/en/faqs: > Like Coldcard, the Bitcoin private keys are encrypted on the processor and stored on the secure element And from https://coldcard.com/docs/faq https://coldcard.com/docs/faq: > The ATECC608 is a fixed-function device for private key storage. [...] To be able to read the secrets (ie. wallet seed) out of the secure element [...] Finally, you can apparently just display it in the "advanced" menu: https://coldcard.com/docs/advanced https://coldcard.com/docs/advanced So it seems to me like the secure element limits PIN attempts, but when successfully enter it, the keys are indeed exposed to the main processor.
  • influxmoment 4y ago
    Exporting the key with the advanced menu is not a normal use for the signing device. It's an optional advanced feature
    • lxgr 4y ago
      What prevents an attacker from using it?
      • influxmoment 4y ago
        The pin for the secure element storage from their info