Which requirement requires regular testing of security processes?

Requirement 11 of the PCI DSS specifically focuses on the need for organizations to regularly test their security systems and processes. This includes conducting vulnerability scans, penetration testing, and other assessments to ensure that security measures are effective and to identify any potential weaknesses that could be exploited by attackers.

Regular testing is crucial for maintaining a strong security posture, as it allows organizations to adapt to changing threats, validate their security controls, and ensure compliance with the PCI DSS standard. By instituting a regimen of regular testing, organizations can proactively address vulnerabilities instead of waiting for a potential breach to occur, which is a critical aspect of maintaining the security of cardholder data.

The other requirements focus on different areas of security and compliance; for instance, Requirement 10 emphasizes tracking and monitoring all access to network resources, while Requirement 12 relates to establishing an information security policy. Neither of these requirements specifically addresses the need for regular testing of security processes in the same way that Requirement 11 does. Thus, for ensuring the effectiveness of security processes, regular testing as mandated in Requirement 11 is essential.