What service is used to conduct faster and more efficient security investigations using log data?

Amazon Detective is the correct choice for conducting faster and more efficient security investigations using log data because it is specifically designed for this purpose. It analyzes and processes massive amounts of log data from various AWS sources, such as AWS CloudTrail, Amazon VPC Flow Logs, and Amazon GuardDuty findings. This service automatically collects and organizes log data, allowing security teams to visualize and understand potential security issues more effectively.

Detective employs machine learning and graph theory techniques to correlate log data and uncover suspicious activity patterns. This capability significantly simplifies the investigation process, as it provides security professionals with insights that would be much harder to gather manually from raw log files. It enables quicker identification of the root cause of incidents and supports a more efficient remediation process.

Other services mentioned serve different functions in the AWS security ecosystem. For example, AWS KMS is focused on managing encryption keys, while Network Access Analyzer is geared towards analyzing network access configurations. AWS Security Hub offers a broader view of security alerts across the AWS environment, consolidating findings from various security services but does not conduct investigations in the same detailed manner as Amazon Detective.