Most people who build or use today's supposedly secure systems have fallen under the illusion that complex encryption algorithms are enough to protect data. As a consequence, they leave their data or keys protecting their data exposed for theft. A key component of any secure system is the physical security of the electronics involved. Because logical attacks, such as breaking a cryptographic key, are infeasible, attacking a system physically becomes an appealing option. Once someone gains physical access to equipment, stealing sensitive information can be as simple as attaching a scope. Depending on the sensitivity of information your system will process, you might also consider some of the ways you can make your designs physically more resistant to such attacks.
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