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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

Your company must exchange sensitive research data with several external partners. The partners propose using their existing PGP keypairs, which they mutually sign and distribute. Your security architect instead recommends issuing X.509 certificates to all parties from the organization's AWS Private CA, following a traditional CA hierarchy. When evaluating these two approaches, which statement correctly identifies a fundamental difference between a PGP-style Web of Trust (WoT) and a hierarchical PKI?

  • Hierarchical PKI lacks any formal revocation capabilities, while a Web of Trust provides universally recognized certificate revocation lists.

  • A Web of Trust depends on a central registration authority to distribute certificates, whereas a hierarchical PKI relies on peer-to-peer key signing between users.

  • In a Web of Trust, users build trust by directly signing each other's keys, eliminating the need for a central certificate authority that is fundamental to a hierarchical PKI.

  • Hierarchical PKI cannot scale to large user communities, but a Web of Trust does so automatically through built-in path discovery and validation.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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