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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

A financial services company wants long-term protection for highly confidential data exchanged between two data centers that are 80 km apart. Engineers suggest deploying a point-to-point fiber link that uses Quantum Key Distribution (QKD) to generate encryption keys. To help leadership understand the proposal, which statement correctly characterizes how QKD improves security during key exchange?

  • It sends one-time symmetric keys encoded in single photons, where any interception disturbs the photons' quantum state and is immediately detectable by the legitimate endpoints.

  • It relies on optical amplifiers to boost quantum signals, enabling secure key exchange over unlimited distances on existing fiber backbones.

  • It provides built-in authentication, so no separate classical channel or digital certificates are required to verify the parties' identities.

  • It encapsulates quantum keys inside standard TLS handshakes, allowing secure deployment across the public internet with no specialized links.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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