Today’s embedded systems often handle sensitive information such as application code (IP) and data, so security is a major concern in their design. In order to establish a reasonable basis for judging whether a proposed security system is adequate or overkill, it is necessary to identify perceived security threats. This means we need to understand who the adversaries are, what capabilities they have, and what their goals are? What are we trying to protect, and who or what are we trying to protect against? There is no one-size-fits-all solution, and no security system is 100% secure. However, a security system does not have to be a perfect solution, nor does it need to be so impenetrable that it loses its value. A security system only needs to be secure enough to withstand possible adversary attacks for the expected useful life of the data it protects.
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