That's a claim that hasn't been independently verified. Absent such proof, I'd expect there to be a ready mechanism to get key material off the chip.
Even if the claim is correct, there is no guarantee that the implementation that does use the key material can use it in a way that doesn't reveal the key in another way.
Other supposedly secure key storage mechanisms have had disappointingly little luck against determined attackers. Ask any cryptographer about attacks that reveal key info in deployed and implemented crypto-systems.
Even if the claim is correct, there is no guarantee that the implementation that does use the key material can use it in a way that doesn't reveal the key in another way.
Other supposedly secure key storage mechanisms have had disappointingly little luck against determined attackers. Ask any cryptographer about attacks that reveal key info in deployed and implemented crypto-systems.