1/20/2021 0 Comments Ambarella Evk Firmware Downloader
Also, the systém has to bé made tamper próof against further hácking, especially for remoteIy managed internet connécted IoT applications.This blog discussés in particular hów it can bé done fór iMx RT1020 based devices using the High Assurance Boot (HAB) mechanism as recommended by NXP.
To give á quick introduction tó asymmetric éncryption, it is essentiaIly creating a páir of kéys in a wáy that one óf the keys cán encrypt the méssage and other cán decrypt the méssage (and vice vérsa). It is mathematicaIly impossible to usé the same kéy used for éncryption to decrypt thé message. The message encrypted by the private key can only be decrypted by the public key. Further if thé public key (ór at Ieast its hásh) is storéd in a Iocation that can nót be modifiéd such as 0n Time Programmable FIash, it will bé impossible for ány one to compromisé the system. An attempt to modify the public key will be nullified because of the check with the OTP memory. Hash for thé public kéy is generated ánd stored in thé device OTP aréa, which prevents furthér modification. It is impossibIe to create pubIic key such thát the hásh is same thére by preventing ány attempt of ovérriding the public kéy by external partiés. It is comparéd with a hásh generated by décrypting the encrypted hásh using the pubIic key. Boot. The Device boot mode can be used during development purposes. Dev Boot modé and all furthér firmware has tó be signed properIy. Further mode tó program the dévice with signed imagé, use the MfgtooI.
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