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Exam Code: CISSP
Exam Name: Certified Information Systems Security Professional
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Certified Information Systems Security Professional CISSP Practice Test 24

Question 230

An encrypted archive must remain decryptable during planned administrator turnover. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm the archive file exists without restoring it under successor credentials
  2. Perform controlled restore with authorized successor custodians
  3. Check key-rotation job success but not access to legacy encrypted records
  4. Review the former administrator's recovery documentation without performing controlled handover tests

Explanation

Correct Answer

B:

Key continuity must be planned independently of ciphertext storage. The result of the remedy is checked directly: Perform controlled restore with authorized successor custodians.

Incorrect Answers

A:

“Confirm the archive file exists without restoring it under successor credentials” evaluates something other than the specified fix. The meaningful evidence is “Perform controlled restore with authorized successor custodians”, reflecting the requirement that key continuity must be planned independently of ciphertext storage.

C:

“Check key-rotation job success but not access to legacy encrypted records” evaluates something other than the specified fix. The meaningful evidence is “Perform controlled restore with authorized successor custodians”, reflecting the requirement that key continuity must be planned independently of ciphertext storage.

D:

“Review the former administrator's recovery documentation without performing controlled handover tests” is insufficient to demonstrate that “Implement documented key rotation, escrow and recovery ownership” works. Key continuity must be planned independently of ciphertext storage. The decisive test is “Perform controlled restore with authorized successor custodians”.

Question 231

Two communicating services need rapid encryption of bulk data. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Use a fast symmetric cipher with a fixed hard-coded key shared across all deployments
  2. Negotiate a session key without authenticating the peer and accept any intermediary as trusted
  3. Use an authenticated symmetric session key negotiated through an appropriate protocol
  4. Protect bulk traffic by encrypting each payload entirely with an expensive asymmetric operation

Explanation

Correct Answer

C:

Symmetric cryptography is suited to bulk protection but requires secure key establishment. A direct way to confirm the outcome is to verify negotiated cipher and authentication under captured handshake.

Incorrect Answers

A:

“Use a fast symmetric cipher with a fixed hard-coded key shared across all deployments” leaves the essential control missing: symmetric cryptography is suited to bulk protection but requires secure key establishment. The direct corrective action is “Use an authenticated symmetric session key negotiated through an appropriate protocol”, validated by the acceptance check “Verify negotiated cipher and authentication under captured handshake”.

B:

“Negotiate a session key without authenticating the peer and accept any intermediary as trusted” would not establish the protection described: symmetric cryptography is suited to bulk protection but requires secure key establishment. The necessary change is “Use an authenticated symmetric session key negotiated through an appropriate protocol” with the verification “Verify negotiated cipher and authentication under captured handshake”.

D:

“Protect bulk traffic by encrypting each payload entirely with an expensive asymmetric operation” would not establish the protection described: symmetric cryptography is suited to bulk protection but requires secure key establishment. The necessary change is “Use an authenticated symmetric session key negotiated through an appropriate protocol” with the verification “Verify negotiated cipher and authentication under captured handshake”.

Question 232

Two communicating services need rapid encryption of bulk data. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Check ciphertext is nonreadable while the shared session key remains predictable or unauthenticated
  2. Measure encryption throughput without verifying session key establishment and peer authentication
  3. Confirm the negotiated cipher name but not whether an attacker can alter the handshake
  4. Verify negotiated cipher and authentication under captured handshake

Explanation

Correct Answer

D:

Symmetric cryptography is suited to bulk protection but requires secure key establishment. The result of the remedy is checked directly: Verify negotiated cipher and authentication under captured handshake.

Incorrect Answers

A:

An observation of “Check ciphertext is nonreadable while the shared session key remains predictable or unauthenticated” would not verify the relevant control. Symmetric cryptography is suited to bulk protection but requires secure key establishment. The necessary acceptance evidence is “Verify negotiated cipher and authentication under captured handshake”.

B:

The acceptance test must demonstrate “Verify negotiated cipher and authentication under captured handshake” because symmetric cryptography is suited to bulk protection but requires secure key establishment. “Measure encryption throughput without verifying session key establishment and peer authentication” cannot establish that result.

C:

An observation of “Confirm the negotiated cipher name but not whether an attacker can alter the handshake” would not verify the relevant control. Symmetric cryptography is suited to bulk protection but requires secure key establishment. The necessary acceptance evidence is “Verify negotiated cipher and authentication under captured handshake”.

Question 233

A partner requires proof that signed invoices originate from the company's authorized key. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Issue certificate-backed signatures with validated trust and revocation rules
  2. Compare invoice file hashes without verifying the signer's authorized certificate or key custody
  3. Encrypt the invoice to the partner and treat secrecy as proof of organizational authorship
  4. Accept a self-signed certificate without checking authorized trust roots or revocation status

Explanation

Correct Answer

A:

Public-key signatures provide attribution when key custody is trustworthy. A direct way to confirm the outcome is to validate signatures and certificate paths using a rejecting trust client.

Incorrect Answers

B:

“Compare invoice file hashes without verifying the signer's authorized certificate or key custody” is not the relevant mitigation. Public-key signatures provide attribution when key custody is trustworthy. The scenario calls for “Issue certificate-backed signatures with validated trust and revocation rules”; the acceptance check is “Validate signatures and certificate paths using a rejecting trust client”.

C:

The proposal “Encrypt the invoice to the partner and treat secrecy as proof of organizational authorship” does not meet the relevant requirement because public-key signatures provide attribution when key custody is trustworthy. The matching remediation is “Issue certificate-backed signatures with validated trust and revocation rules”.

D:

“Accept a self-signed certificate without checking authorized trust roots or revocation status” is not the relevant mitigation. Public-key signatures provide attribution when key custody is trustworthy. The scenario calls for “Issue certificate-backed signatures with validated trust and revocation rules”; the acceptance check is “Validate signatures and certificate paths using a rejecting trust client”.

Question 234

A partner requires proof that signed invoices originate from the company's authorized key. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Verify the invoice can be decrypted but not the authenticated origin of its signature
  2. Validate signatures and certificate paths using a rejecting trust client
  3. Check certificate expiration only while accepting an untrusted or revoked signing key
  4. Confirm a signature byte string exists without validating the certificate path or signer identity

Explanation

Correct Answer

B:

Public-key signatures provide attribution when key custody is trustworthy. The result of the remedy is checked directly: Validate signatures and certificate paths using a rejecting trust client.

Incorrect Answers

A:

Public-key signatures provide attribution when key custody is trustworthy. The proposed check, “Verify the invoice can be decrypted but not the authenticated origin of its signature”, misses the relevant outcome; “Validate signatures and certificate paths using a rejecting trust client” tests whether the intended remedy worked.

C:

Public-key signatures provide attribution when key custody is trustworthy. The proposed check, “Check certificate expiration only while accepting an untrusted or revoked signing key”, misses the relevant outcome; “Validate signatures and certificate paths using a rejecting trust client” tests whether the intended remedy worked.

D:

“Confirm a signature byte string exists without validating the certificate path or signer identity” does not show the required outcome: validate signatures and certificate paths using a rejecting trust client. That test matters because public-key signatures provide attribution when key custody is trustworthy.

Question 235

A product still uses a deprecated cryptographic algorithm for new long-term records. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Upgrade only the TLS front end while long-lived archive encryption remains deprecated
  2. Continue using the deprecated algorithm because existing records still decrypt successfully
  3. Perform cryptographic agility assessment and migrate to approved algorithms
  4. Change the encryption key identifier but retain the same obsolete algorithm for new records

Explanation

Correct Answer

C:

Algorithms and key sizes require lifecycle review, not perpetual reuse. A direct way to confirm the outcome is to inspect new ciphertext metadata and interoperability tests.

Incorrect Answers

A:

The security distinction is that algorithms and key sizes require lifecycle review, not perpetual reuse. “Upgrade only the TLS front end while long-lived archive encryption remains deprecated” addresses neither the required “Perform cryptographic agility assessment and migrate to approved algorithms” action nor its supporting evidence: “Inspect new ciphertext metadata and interoperability tests”.

B:

Algorithms and key sizes require lifecycle review, not perpetual reuse. “Continue using the deprecated algorithm because existing records still decrypt successfully” does not supply that control; “Perform cryptographic agility assessment and migrate to approved algorithms” addresses the identified gap, and “Inspect new ciphertext metadata and interoperability tests” verifies the result.

D:

Algorithms and key sizes require lifecycle review, not perpetual reuse. “Change the encryption key identifier but retain the same obsolete algorithm for new records” does not supply that control; “Perform cryptographic agility assessment and migrate to approved algorithms” addresses the identified gap, and “Inspect new ciphertext metadata and interoperability tests” verifies the result.

Question 236

A product still uses a deprecated cryptographic algorithm for new long-term records. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm historical ciphertext can still be read without inspecting new algorithm metadata
  2. Check a security policy announcement without validating deployed cryptographic primitives
  3. Test the application interface but ignore the actual encryption mode used for newly stored data
  4. Inspect new ciphertext metadata and interoperability tests

Explanation

Correct Answer

D:

Algorithms and key sizes require lifecycle review, not perpetual reuse. The result of the remedy is checked directly: Inspect new ciphertext metadata and interoperability tests.

Incorrect Answers

A:

“Confirm historical ciphertext can still be read without inspecting new algorithm metadata” evaluates something other than the specified fix. The meaningful evidence is “Inspect new ciphertext metadata and interoperability tests”, reflecting the requirement that algorithms and key sizes require lifecycle review, not perpetual reuse.

B:

“Check a security policy announcement without validating deployed cryptographic primitives” is insufficient to demonstrate that “Perform cryptographic agility assessment and migrate to approved algorithms” works. Algorithms and key sizes require lifecycle review, not perpetual reuse. The decisive test is “Inspect new ciphertext metadata and interoperability tests”.

C:

“Test the application interface but ignore the actual encryption mode used for newly stored data” evaluates something other than the specified fix. The meaningful evidence is “Inspect new ciphertext metadata and interoperability tests”, reflecting the requirement that algorithms and key sizes require lifecycle review, not perpetual reuse.

Question 237

A web service must recover from a lost private key without exposing stored secrets. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Use key separation, bounded recovery authority and tested reissuance procedures
  2. Reissue the same compromised identity credential without rotating affected trust relationships
  3. Share recovery secrets with all administrators so loss of a single custodian never causes downtime
  4. Restore service with a copied old private key that is no longer controlled or trustworthy

Explanation

Correct Answer

A:

Key backup for encryption and certificate revocation for identity have distinct goals. A direct way to confirm the outcome is to revoke the old credential and verify controlled service recovery.

Incorrect Answers

B:

“Reissue the same compromised identity credential without rotating affected trust relationships” would not establish the protection described: key backup for encryption and certificate revocation for identity have distinct goals. The necessary change is “Use key separation, bounded recovery authority and tested reissuance procedures” with the verification “Revoke the old credential and verify controlled service recovery”.

C:

“Share recovery secrets with all administrators so loss of a single custodian never causes downtime” leaves the essential control missing: key backup for encryption and certificate revocation for identity have distinct goals. The direct corrective action is “Use key separation, bounded recovery authority and tested reissuance procedures”, validated by the acceptance check “Revoke the old credential and verify controlled service recovery”.

D:

“Restore service with a copied old private key that is no longer controlled or trustworthy” would not establish the protection described: key backup for encryption and certificate revocation for identity have distinct goals. The necessary change is “Use key separation, bounded recovery authority and tested reissuance procedures” with the verification “Revoke the old credential and verify controlled service recovery”.

Question 238

A web service must recover from a lost private key without exposing stored secrets. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Inspect key inventory totals without testing authorized recovery and containment of the missing secret
  2. Revoke the old credential and verify controlled service recovery
  3. Confirm a new certificate exists but skip revocation and service cutover from the lost key
  4. Check service availability without attempting rejection of the old credential

Explanation

Correct Answer

B:

Key backup for encryption and certificate revocation for identity have distinct goals. The result of the remedy is checked directly: Revoke the old credential and verify controlled service recovery.

Incorrect Answers

A:

An observation of “Inspect key inventory totals without testing authorized recovery and containment of the missing secret” would not verify the relevant control. Key backup for encryption and certificate revocation for identity have distinct goals. The necessary acceptance evidence is “Revoke the old credential and verify controlled service recovery”.

C:

An observation of “Confirm a new certificate exists but skip revocation and service cutover from the lost key” would not verify the relevant control. Key backup for encryption and certificate revocation for identity have distinct goals. The necessary acceptance evidence is “Revoke the old credential and verify controlled service recovery”.

D:

The acceptance test must demonstrate “Revoke the old credential and verify controlled service recovery” because key backup for encryption and certificate revocation for identity have distinct goals. “Check service availability without attempting rejection of the old credential” cannot establish that result.

Question 239

A legacy password database stores unsalted fast hashes. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Hash passwords with a fast general-purpose digest and no unique per-user salt
  2. Apply identical static salt across all accounts while retaining inexpensive password hashing
  3. Use purpose-built slow password hashing with unique salts and suitable work factors
  4. Encrypt the password database but store raw fast hashes suitable for high-speed offline guessing

Explanation

Correct Answer

C:

Fast general hashing and salts alone do not resist offline guessing adequately. A direct way to confirm the outcome is to test identical passwords generate distinct stored hashes and benchmark cost.

Incorrect Answers

A:

The proposal “Hash passwords with a fast general-purpose digest and no unique per-user salt” does not meet the relevant requirement because fast general hashing and salts alone do not resist offline guessing adequately. The matching remediation is “Use purpose-built slow password hashing with unique salts and suitable work factors”.

B:

“Apply identical static salt across all accounts while retaining inexpensive password hashing” is not the relevant mitigation. Fast general hashing and salts alone do not resist offline guessing adequately. The scenario calls for “Use purpose-built slow password hashing with unique salts and suitable work factors”; the acceptance check is “Test identical passwords generate distinct stored hashes and benchmark cost”.

D:

“Encrypt the password database but store raw fast hashes suitable for high-speed offline guessing” is not the relevant mitigation. Fast general hashing and salts alone do not resist offline guessing adequately. The scenario calls for “Use purpose-built slow password hashing with unique salts and suitable work factors”; the acceptance check is “Test identical passwords generate distinct stored hashes and benchmark cost”.

Question 240

A legacy password database stores unsalted fast hashes. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Verify application logins work without measuring offline guessing cost or work factors
  2. Confirm database encryption is enabled while password hashing remains unsalted and fast
  3. Check that password hashes have the expected length without comparing identical inputs across users
  4. Test identical passwords generate distinct stored hashes and benchmark cost

Explanation

Correct Answer

D:

Fast general hashing and salts alone do not resist offline guessing adequately. The result of the remedy is checked directly: Test identical passwords generate distinct stored hashes and benchmark cost.

Incorrect Answers

A:

Fast general hashing and salts alone do not resist offline guessing adequately. The proposed check, “Verify application logins work without measuring offline guessing cost or work factors”, misses the relevant outcome; “Test identical passwords generate distinct stored hashes and benchmark cost” tests whether the intended remedy worked.

B:

“Confirm database encryption is enabled while password hashing remains unsalted and fast” does not show the required outcome: test identical passwords generate distinct stored hashes and benchmark cost. That test matters because fast general hashing and salts alone do not resist offline guessing adequately.

C:

Fast general hashing and salts alone do not resist offline guessing adequately. The proposed check, “Check that password hashes have the expected length without comparing identical inputs across users”, misses the relevant outcome; “Test identical passwords generate distinct stored hashes and benchmark cost” tests whether the intended remedy worked.

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