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Exam Code: 312-50v13

Exam Name Certified Ethical Hacker v13

Certification Provider: ECCouncil

Corresponding Certification: CEH

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ECCouncil 312-50v13 Practice Test 78

Question 770

At Timberline Foods, the supply-chain assurance team is conducting a coordinated processing-plant assessment under requirements for food safety and secure logistics. The team now needs objective retest evidence for: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. Which result BEST demonstrates successful remediation?

  1. Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key.
  2. A newly signed message validates under the current trust chain and invalid signatures are reported clearly.
  3. The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.
  4. A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites.

Explanation

Correct Answer

C:

The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate. The observable result demonstrates that the documented condition, A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. has been addressed. The planned remediation is: Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors. This is a stronger validation than a saved ticket or unverified claim by Timberline Foods.

Incorrect Answers

A:

Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key. That observation would verify another scenario: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The corrective step for that other scenario is: Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. But Timberline Foods is evaluating: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The necessary outcome is: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

B:

A newly signed message validates under the current trust chain and invalid signatures are reported clearly. That observation would verify another scenario: A company signs email using an expired certificate and assumes recipients will continue to trust the signature indefinitely. The corrective step for that other scenario is: Renew the appropriate certificate and verify signature validity, chain, and trusted timestamp policy. But Timberline Foods is evaluating: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The necessary outcome is: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

D:

A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites. That observation would verify another scenario: An engineer selects an obsolete cryptographic protocol for internal traffic because the network is not reachable directly from the internet. The corrective step for that other scenario is: Require approved modern TLS configurations on internal services and phase out deprecated algorithms. But Timberline Foods is evaluating: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The necessary outcome is: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

Question 771

At Silvercrest University, the campus cyber defense team is conducting an approved research-network assessment under requirements for governed research assets and minimal data collection. The control assessment finds: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. Which action BEST addresses the documented security gap?

  1. Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism.
  2. Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors.
  3. Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation.
  4. Require approved modern TLS configurations on internal services and phase out deprecated algorithms.

Explanation

Correct Answer

B:

Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors. This directly addresses the authorized assessment finding: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The Silvercrest University team should verify the outcome rather than treat a configuration edit as proof. Acceptance evidence: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

Incorrect Answers

A:

Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. This is an appropriate control for a different issue: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The Silvercrest University finding instead concerns: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. It does not demonstrate the required correction. The decisive test remains: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

C:

Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation. This is an appropriate control for a different issue: An administrator rotates a disk-encryption key without preserving recovery policy and makes a test laptop unable to unlock its data. The Silvercrest University finding instead concerns: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. It does not demonstrate the required correction. The decisive test remains: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

D:

Require approved modern TLS configurations on internal services and phase out deprecated algorithms. This is an appropriate control for a different issue: An engineer selects an obsolete cryptographic protocol for internal traffic because the network is not reachable directly from the internet. The Silvercrest University finding instead concerns: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. It does not demonstrate the required correction. The decisive test remains: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

Question 772

At Silvercrest University, the campus cyber defense team is conducting an approved research-network assessment under requirements for governed research assets and minimal data collection. An independent validation is requested for the original problem: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. Which result BEST demonstrates successful remediation?

  1. The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.
  2. The device rotates to the new key and a verified authorized recovery procedure restores access successfully.
  3. A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites.
  4. Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key.

Explanation

Correct Answer

A:

The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate. The observable result demonstrates that the documented condition, A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. has been addressed. The planned remediation is: Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors. This is a stronger validation than a saved ticket or unverified claim by Silvercrest University.

Incorrect Answers

B:

The device rotates to the new key and a verified authorized recovery procedure restores access successfully. That observation would verify another scenario: An administrator rotates a disk-encryption key without preserving recovery policy and makes a test laptop unable to unlock its data. The corrective step for that other scenario is: Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation. But Silvercrest University is evaluating: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The necessary outcome is: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

C:

A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites. That observation would verify another scenario: An engineer selects an obsolete cryptographic protocol for internal traffic because the network is not reachable directly from the internet. The corrective step for that other scenario is: Require approved modern TLS configurations on internal services and phase out deprecated algorithms. But Silvercrest University is evaluating: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The necessary outcome is: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

D:

Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key. That observation would verify another scenario: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The corrective step for that other scenario is: Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. But Silvercrest University is evaluating: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The necessary outcome is: The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

Question 773

At Meadowbrook Finance, the banking cyber assurance team is conducting a controlled financial-services security review under requirements for auditability and transaction integrity. The authorized review identifies: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. Which action BEST addresses the documented security gap?

  1. Use a memory-hard password hashing mechanism with unique salts and an appropriate work factor.
  2. Protect encryption keys with a managed key vault or HSM and enforce separate access and rotation controls.
  3. Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism.
  4. Use an authenticated digital signature or message-authentication mechanism where sender authenticity is required.

Explanation

Correct Answer

D:

Use an authenticated digital signature or message-authentication mechanism where sender authenticity is required. This directly addresses the authorized assessment finding: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The Meadowbrook Finance team should verify the outcome rather than treat a configuration edit as proof. Acceptance evidence: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

Incorrect Answers

A:

Use a memory-hard password hashing mechanism with unique salts and an appropriate work factor. This is an appropriate control for a different issue: A developer uses an unsalted fast checksum function to store user passwords in the authentication database. The Meadowbrook Finance finding instead concerns: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. It does not demonstrate the required correction. The decisive test remains: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

B:

Protect encryption keys with a managed key vault or HSM and enforce separate access and rotation controls. This is an appropriate control for a different issue: An application encrypts customer data but stores the encryption key in the same publicly readable configuration file. The Meadowbrook Finance finding instead concerns: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. It does not demonstrate the required correction. The decisive test remains: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

C:

Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. This is an appropriate control for a different issue: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The Meadowbrook Finance finding instead concerns: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. It does not demonstrate the required correction. The decisive test remains: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

Question 774

At Meadowbrook Finance, the banking cyber assurance team is conducting a controlled financial-services security review under requirements for auditability and transaction integrity. Following the approved correction, auditors require proof that: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. Which result BEST demonstrates successful remediation?

  1. Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.
  2. Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key.
  3. An unprivileged user cannot retrieve key material even when able to read ordinary application configuration.
  4. A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites.

Explanation

Correct Answer

A:

Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum. The observable result demonstrates that the documented condition, A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. has been addressed. The planned remediation is: Use an authenticated digital signature or message-authentication mechanism where sender authenticity is required. This is a stronger validation than a saved ticket or unverified claim by Meadowbrook Finance.

Incorrect Answers

B:

Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key. That observation would verify another scenario: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The corrective step for that other scenario is: Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. But Meadowbrook Finance is evaluating: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The necessary outcome is: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

C:

An unprivileged user cannot retrieve key material even when able to read ordinary application configuration. That observation would verify another scenario: An application encrypts customer data but stores the encryption key in the same publicly readable configuration file. The corrective step for that other scenario is: Protect encryption keys with a managed key vault or HSM and enforce separate access and rotation controls. But Meadowbrook Finance is evaluating: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The necessary outcome is: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

D:

A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites. That observation would verify another scenario: An engineer selects an obsolete cryptographic protocol for internal traffic because the network is not reachable directly from the internet. The corrective step for that other scenario is: Require approved modern TLS configurations on internal services and phase out deprecated algorithms. But Meadowbrook Finance is evaluating: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The necessary outcome is: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

Question 775

At Harborline Logistics, the warehouse security team is conducting a contracted distribution-system assessment under requirements for scanner uptime and controlled supplier access. Assessors report the following documented condition: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. Which action BEST addresses the documented security gap?

  1. Combine confidentiality controls with isolated immutable backup retention and verified recovery testing.
  2. Use an authenticated digital signature or message-authentication mechanism where sender authenticity is required.
  3. Protect encryption keys with a managed key vault or HSM and enforce separate access and rotation controls.
  4. Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism.

Explanation

Correct Answer

B:

Use an authenticated digital signature or message-authentication mechanism where sender authenticity is required. This directly addresses the authorized assessment finding: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The Harborline Logistics team should verify the outcome rather than treat a configuration edit as proof. Acceptance evidence: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

Incorrect Answers

A:

Combine confidentiality controls with isolated immutable backup retention and verified recovery testing. This is an appropriate control for a different issue: A team assumes that encrypting a backup makes its deletion by ransomware impossible and therefore performs no restore drills. The Harborline Logistics finding instead concerns: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. It does not demonstrate the required correction. The decisive test remains: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

C:

Protect encryption keys with a managed key vault or HSM and enforce separate access and rotation controls. This is an appropriate control for a different issue: An application encrypts customer data but stores the encryption key in the same publicly readable configuration file. The Harborline Logistics finding instead concerns: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. It does not demonstrate the required correction. The decisive test remains: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

D:

Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. This is an appropriate control for a different issue: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The Harborline Logistics finding instead concerns: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. It does not demonstrate the required correction. The decisive test remains: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

Question 776

At Harborline Logistics, the warehouse security team is conducting a contracted distribution-system assessment under requirements for scanner uptime and controlled supplier access. The team now needs objective retest evidence for: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. Which result BEST demonstrates successful remediation?

  1. A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites.
  2. A simulated loss restores the correct version of data from a protected backup without relying on an exposed production key.
  3. Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.
  4. A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Explanation

Correct Answer

C:

Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum. The observable result demonstrates that the documented condition, A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. has been addressed. The planned remediation is: Use an authenticated digital signature or message-authentication mechanism where sender authenticity is required. This is a stronger validation than a saved ticket or unverified claim by Harborline Logistics.

Incorrect Answers

A:

A protocol scan rejects obsolete handshakes while approved internal applications negotiate supported cipher suites. That observation would verify another scenario: An engineer selects an obsolete cryptographic protocol for internal traffic because the network is not reachable directly from the internet. The corrective step for that other scenario is: Require approved modern TLS configurations on internal services and phase out deprecated algorithms. But Harborline Logistics is evaluating: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The necessary outcome is: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

B:

A simulated loss restores the correct version of data from a protected backup without relying on an exposed production key. That observation would verify another scenario: A team assumes that encrypting a backup makes its deletion by ransomware impossible and therefore performs no restore drills. The corrective step for that other scenario is: Combine confidentiality controls with isolated immutable backup retention and verified recovery testing. But Harborline Logistics is evaluating: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The necessary outcome is: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

D:

A test harness confirms nonce uniqueness and altered ciphertext fails authentication. That observation would verify another scenario: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The corrective step for that other scenario is: Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys. But Harborline Logistics is evaluating: A file-transfer workflow hashes files with SHA-256 and concludes that this alone proves who sent the file. The necessary outcome is: Recipients can verify the authorized sender and detect a modified transfer independently of the plain checksum.

Question 777

At Alpine Healthcare, the clinical technology defense team is conducting an authorized hospital risk exercise under requirements for patient safety and minimized disruption. The control assessment finds: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. Which action BEST addresses the documented security gap?

  1. Require approved modern TLS configurations on internal services and phase out deprecated algorithms.
  2. Combine confidentiality controls with isolated immutable backup retention and verified recovery testing.
  3. Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys.
  4. Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation.

Explanation

Correct Answer

C:

Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys. This directly addresses the authorized assessment finding: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The Alpine Healthcare team should verify the outcome rather than treat a configuration edit as proof. Acceptance evidence: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Incorrect Answers

A:

Require approved modern TLS configurations on internal services and phase out deprecated algorithms. This is an appropriate control for a different issue: An engineer selects an obsolete cryptographic protocol for internal traffic because the network is not reachable directly from the internet. The Alpine Healthcare finding instead concerns: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. It does not demonstrate the required correction. The decisive test remains: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

B:

Combine confidentiality controls with isolated immutable backup retention and verified recovery testing. This is an appropriate control for a different issue: A team assumes that encrypting a backup makes its deletion by ransomware impossible and therefore performs no restore drills. The Alpine Healthcare finding instead concerns: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. It does not demonstrate the required correction. The decisive test remains: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

D:

Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation. This is an appropriate control for a different issue: An administrator rotates a disk-encryption key without preserving recovery policy and makes a test laptop unable to unlock its data. The Alpine Healthcare finding instead concerns: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. It does not demonstrate the required correction. The decisive test remains: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Question 778

At Alpine Healthcare, the clinical technology defense team is conducting an authorized hospital risk exercise under requirements for patient safety and minimized disruption. An independent validation is requested for the original problem: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. Which result BEST demonstrates successful remediation?

  1. The device rotates to the new key and a verified authorized recovery procedure restores access successfully.
  2. A simulated loss restores the correct version of data from a protected backup without relying on an exposed production key.
  3. Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key.
  4. A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Explanation

Correct Answer

D:

A test harness confirms nonce uniqueness and altered ciphertext fails authentication. The observable result demonstrates that the documented condition, A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. has been addressed. The planned remediation is: Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys. This is a stronger validation than a saved ticket or unverified claim by Alpine Healthcare.

Incorrect Answers

A:

The device rotates to the new key and a verified authorized recovery procedure restores access successfully. That observation would verify another scenario: An administrator rotates a disk-encryption key without preserving recovery policy and makes a test laptop unable to unlock its data. The corrective step for that other scenario is: Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation. But Alpine Healthcare is evaluating: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The necessary outcome is: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

B:

A simulated loss restores the correct version of data from a protected backup without relying on an exposed production key. That observation would verify another scenario: A team assumes that encrypting a backup makes its deletion by ransomware impossible and therefore performs no restore drills. The corrective step for that other scenario is: Combine confidentiality controls with isolated immutable backup retention and verified recovery testing. But Alpine Healthcare is evaluating: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The necessary outcome is: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

C:

Large files encrypt efficiently while only the intended recipient can recover the protected symmetric key. That observation would verify another scenario: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The corrective step for that other scenario is: Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. But Alpine Healthcare is evaluating: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The necessary outcome is: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Question 779

At Timberline Foods, the supply-chain assurance team is conducting a coordinated processing-plant assessment under requirements for food safety and secure logistics. The authorized review identifies: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. Which action BEST addresses the documented security gap?

  1. Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys.
  2. Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism.
  3. Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors.
  4. Use a memory-hard password hashing mechanism with unique salts and an appropriate work factor.

Explanation

Correct Answer

A:

Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys. This directly addresses the authorized assessment finding: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The Timberline Foods team should verify the outcome rather than treat a configuration edit as proof. Acceptance evidence: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Incorrect Answers

B:

Use a random symmetric data-encryption key and protect it with an appropriate public-key or key-agreement mechanism. This is an appropriate control for a different issue: A payment service uses RSA encryption directly on large files rather than a modern hybrid-encryption design. The Timberline Foods finding instead concerns: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. It does not demonstrate the required correction. The decisive test remains: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

C:

Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors. This is an appropriate control for a different issue: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The Timberline Foods finding instead concerns: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. It does not demonstrate the required correction. The decisive test remains: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

D:

Use a memory-hard password hashing mechanism with unique salts and an appropriate work factor. This is an appropriate control for a different issue: A developer uses an unsalted fast checksum function to store user passwords in the authentication database. The Timberline Foods finding instead concerns: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. It does not demonstrate the required correction. The decisive test remains: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

Question 780

At Timberline Foods, the supply-chain assurance team is conducting a coordinated processing-plant assessment under requirements for food safety and secure logistics. Following the approved correction, auditors require proof that: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. Which result BEST demonstrates successful remediation?

  1. The device rotates to the new key and a verified authorized recovery procedure restores access successfully.
  2. A test harness confirms nonce uniqueness and altered ciphertext fails authentication.
  3. An unprivileged user cannot retrieve key material even when able to read ordinary application configuration.
  4. The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate.

Explanation

Correct Answer

B:

A test harness confirms nonce uniqueness and altered ciphertext fails authentication. The observable result demonstrates that the documented condition, A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. has been addressed. The planned remediation is: Use an authenticated encryption scheme with safely generated non-reused nonces and protected keys. This is a stronger validation than a saved ticket or unverified claim by Timberline Foods.

Incorrect Answers

A:

The device rotates to the new key and a verified authorized recovery procedure restores access successfully. That observation would verify another scenario: An administrator rotates a disk-encryption key without preserving recovery policy and makes a test laptop unable to unlock its data. The corrective step for that other scenario is: Plan protected recovery escrow and test key lifecycle operations before enforcing device-wide rotation. But Timberline Foods is evaluating: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The necessary outcome is: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

C:

An unprivileged user cannot retrieve key material even when able to read ordinary application configuration. That observation would verify another scenario: An application encrypts customer data but stores the encryption key in the same publicly readable configuration file. The corrective step for that other scenario is: Protect encryption keys with a managed key vault or HSM and enforce separate access and rotation controls. But Timberline Foods is evaluating: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The necessary outcome is: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.

D:

The client rejects an untrusted or wrong-name test certificate while accepting the legitimate service certificate. That observation would verify another scenario: A service presents a certificate signed by an unknown private CA and the client accepts it without checking trust and hostname. The corrective step for that other scenario is: Validate the full certificate chain, identity and validity interval against trusted roots rather than ignoring verification errors. But Timberline Foods is evaluating: A database uses a fixed initialization vector for repeated encryption of confidential records with a mode that requires unique nonces. The necessary outcome is: A test harness confirms nonce uniqueness and altered ciphertext fails authentication.