Automated attacks that attempt to exploit weak or leaked passwords—such as credential stuffing, brute force attacks, and dictionary attacks—pose a significant cybersecurity risk. Implementing two-step verification (also known as multi-factor authentication, or MFA) is one of the most effective measures to mitigate these threats.

Why Two-Step Verification is Effective (B - Correct Answer)

Multi-factor authentication (MFA) adds an additional security layer beyond a password, requiring a second factor such as a one-time code sent to a mobile device, biometric authentication, or a security key.

Even if an attacker obtains a password, they cannot access the account without the second authentication factor.

The IIA Global Technology Audit Guide (GTAG) 1: Information Security Management emphasizes the use of multi-factor authentication to prevent unauthorized access.

Why Other Options Are Less Effective:

Option A: Changing passwords every two years

Ineffective because attackers often use compromised credentials that may be recent. Best practices recommend regular password updates but coupled with MFA.

The IIA's GTAG 16: Identity and Access Management highlights that password rotation alone does not fully protect against automated attacks.

Option C: Using a VPN when out of the office

Irrelevant to password attacks. A VPN encrypts data and secures network connections but does not prevent brute force or credential stuffing attacks.

The IIA GTAG 17: Auditing Network Security discusses VPNs for secure remote access but does not consider them a solution for password-based attacks.

Option D: Using antivirus and security tools

While important for overall security, these tools cannot prevent attacks that exploit stolen or weak passwords.

The IIA GTAG 15: Information Security Governance states that security tools should be combined with authentication controls like MFA for best protection.

GTAG 1: Information Security Management – Recommends multi-factor authentication to prevent unauthorized system access.

GTAG 16: Identity and Access Management – Highlights the limitations of password-only security and supports multi-factor authentication.

GTAG 17: Auditing Network Security – Covers VPN usage but does not consider it a solution for password attacks.

GTAG 15: Information Security Governance – Discusses the role of security tools and authentication in securing user accounts.

Step-by-Step Explanation:IIA References for Validation:Thus, requiring two-step verification (B) is the most effective control against automated password attacks.