Question 60
An employee encrypted corporate archives with a unique organization-issued data-decryption key. The employee has left, and the enterprise must recover the archived data lawfully without possessing the person’s signing credential. Which key-lifecycle arrangement should have been put in place?
Explanation
Correct Answer
Governed escrow stores the corporate data-decryption key, or recoverable key material, under organizational controls so archives remain decryptable after the employee leaves. Recovery requires authorized approval, separation of duties where appropriate, audit evidence and protection against unauthorized key release. The arrangement should preserve keys needed for historical ciphertext without giving administrators the departed person's signing identity. Access to archived data must still be legally and operationally authorized; escrow is not a universal authorization bypass.
Incorrect Answers
A private digital-signing key represents the individual's signing identity and can be used to generate signatures attributable to that identity. Retaining it for later impersonation is not the same as recovering encrypted corporate archives and undermines the separation between data recovery and signature authenticity. If signing credentials are compromised or no longer needed, policy may require revocation, but they should not become enterprise recovery keys for unrelated encryption.
Certificate revocation communicates that a certificate should no longer be accepted for certain trust decisions. It does not recreate a lost symmetric encryption key, derive plaintext from ciphertext or supply the recovery material needed to decrypt archived records. Revocation is a lifecycle and trust-control process, whereas the question calls for preserving authorized access to older encrypted data when an employee is absent.
Rotating current encryption keys protects new operations or limits future exposure, but old archives encrypted with a previous key remain unreadable unless that historical key or a supported rewrapping path is retained. The problem specifically concerns already-encrypted corporate records after the employee leaves. Rotation without planned recovery or key retention cannot decrypt historical ciphertext and would risk permanent data loss.