Over-the-air(OTA) of the embedded software requires that the alternative package be complete,legal,and restorable when updating fail.In the paper,a series of embedded security tools and techniques are proposed.Specifically,a rollback mechanism is designed that prevent deadlocks through the hardware watchdog.The validity of alternative package is verified by digital signature.We set up "firewall" to protect core data zone and "sandbox" using "trial run" to verify the modules.
Key words
OTA /
digital signature /
rollback /
embedded software
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