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I.e since the whole lot is implementable in a (Turing full) CPU then how does it matter whether or not a Safe Ingredient has assist for Bitcoin’s cryptographic primitives – aside from making signing and decryption quicker.
Firstly I feel that is barely a false impression, it is very important have the ability to do ECC operations effectively which is why a theoretical Safe Ingredient (SE) with these capabilities would should be environment friendly. Nevertheless the purpose of them is to not compete with the effectivity of say a desktop processor, the purpose is to have a verifiably appropriate and discrete processor that’s environment friendly sufficient do do the operations on a small machine.
Would a tool with a generic CPU the place the software program cannot be modified (with out dropping the secrets and techniques as effectively) with safety towards bodily assaults already be “the dream {hardware} pockets” which does not assist key export it doesn’t matter what?
I’m not certain that good playing cards match this description completely, they retailer info and require bodily interplay to launch secrets and techniques however are usually not made for generic CPU processing if that’s what you’re suggesting.
I need to make clear I’m actually not an skilled on this matter however from what I’ve researched the explanation a sensible card (SC) is just not safer than a SE is since you are inable to safe personal key operations on the SC, you’ll be able to solely use it to retailer the personal information. The SE having the aptitude for secp256k1 (which apparently none do atm) would help you do signing fully airgapped out of your probably weak or already exploited private laptop system or native laptop community. That being mentioned there are non-secp256k1 associated personal operations that may be achieved on the SE, which within the case of an SC would should be carried out in your private laptop system which is an elevated assault floor.
Ledger for example claims that they use the SE to generate personal keys:
Safe Ingredient Chip Protects Your Ledger From Assaults
A Safe Ingredient is a extremely superior chip that mitigates a variety of several types of assaults. This cutting-edge chip, which is utilized in high-level safety options, actually units Ledger aside as a top-end safety resolution for crypto belongings. All of our gadgets use a Safe Ingredient, which vastly enhances their safety. Ledger makes use of them to generate and retailer personal keys on your crypto belongings.
I don’t advocate utilizing ledger in gentle of their latest press releases nevertheless that is an instance of how a SE could be used.
Blockstream Jade adopts a special safety mannequin not based mostly on SE which you will discover to be related:
As an alternative of a safe aspect, Blockstream Jade makes use of a singular safety mannequin that enables it to stay absolutely open-source whereas additionally being protected against bodily assaults and attaining related (if not higher) safety from this potential menace – by appearing as a “digital” safe aspect.
The blind oracle mannequin that Jade makes use of is absolutely open supply, and is really blind. It is aware of nothing about Jade pockets information, and does not even know the person’s precise PIN. Customers might use Blockstream’s blind oracle to guard their pockets, or they could run their very own.
From what I can surmise, an SE may be helpful for sure personal operations corresponding to producing a key nevertheless it doesn’t shut the assault floor fully. An SC as a result of it can’t do any personal operations is a extra open assault floor as a result of it delegates personal operations to any laptop system you plug it into. An open supply blind oracle mannequin could also be an efficient option to lower the assault floor when utilizing a SC or {hardware} with an identical safety mannequin corresponding to I consider Jade may fall into. Nevertheless since all SEs to this point are closed supply it is probably not a viable choice for SE based mostly wallets to implement blind oracles to guard personal key operations but.
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