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The requirements of the Payment Card Industry Data Security Standard (PCI DSS) can be complex. However, taking a deeper look into some of its parts, particularly event log management, can help clarify some terms.
Many companies believe that logging is specified in PCI DSS so that they can discover threats to their networks. While this may be an ancillary benefit, logging was put into PCI for the benefit of the card brands. In the early years of credit card security, card brands put significant effort into determining the attack vectors of credit card breaches. Unfortunately, when they sent teams into retailers to find the root cause of breaches, they discovered only meager evidence to use in tracing attacks. Therefore, the brands introduced logging requirements into their individual cardholder protection efforts so they could find out what happened when a breach occurred. Eventually these requirements found their way into the PCI DSS. Understanding this as the intent of the logging requirements can help companies understand how to implement event log management to best meet PCI DSS compliance requirements.