Security features on K210

[odudex]

Hi, I'm the current maintainer of a K210-based Bitcoin signer project called Krux To enhance security and introduce an anti-tamper feature, I’ve started researching K210 firmware encryption and got surprised when came across this repository. Although the K230 is now available, I believe there's still a lot of untapped potential in the K210 chip. Starting with the original M5StickV, I ported Krux to six other devices with various shapes and UIs. While Sipeed has stopped manufacturing K210 devices like the Amigo, we now have alternatives from vendors such as Yahboom and Hiwonder. However, my knowledge is somewhat limited, so I would appreciate any advice regarding the K210’s capabilities. Specifically, do you think it’s possible to enhance the security of K210-based devices, particularly in terms of anti-tamper solutions? Could we perhaps leverage its OTP memory or firmware encryption for this purpose?