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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

While designing a long-term encryption strategy for an AWS-hosted health records platform, a security engineer proposes adding a dedicated fiber link that uses quantum key distribution (QKD) between the hospital's on-premises facility and its AWS Direct Connect location. The architects want to know what confidentiality benefit this provides over classical key exchange. Which statement correctly describes a fundamental security property of QKD?

  • QKD removes the requirement for a secure random number generator because the key bits are deterministically produced by photon polarization.

  • A key generated with QKD can be safely reused indefinitely because its bits cannot be derived by mathematical analysis.

  • Interception of the quantum channel alters the qubits, allowing both parties to detect eavesdropping and discard the affected key.

  • QKD transmits encrypted application data at terabit speeds, eliminating the need for separate bulk-data ciphers such as AES.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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