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ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

While designing a battery-powered medical implant, your team worries an attacker with physical access could recover the device's AES key by measuring its power usage during firmware updates. Which design decision most directly mitigates this simple power analysis threat?

  • Require mutual TLS for all communications between the implant and external programming devices.

  • Enable hardware write-protection on the flash region that stores the symmetric key material.

  • Switch from 128-bit to 256-bit AES keys to increase resistance against brute-force attacks.

  • Use constant-time cryptographic routines supplemented with data masking to make power consumption independent of secret values.

ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Architecture and Design
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