What technique does Behavior-Based IDS primarily utilize?

Behavior-Based Intrusion Detection Systems (IDS) primarily rely on observing changes from established baseline behavior to identify potential threats. This technique involves monitoring the normal behavior of users, processes, and network traffic within a system or environment. Once a baseline is established, any significant deviations from this behavior can indicate a potential security incident or an intrusion attempt.

By focusing on behavioral patterns rather than relying solely on known signatures of attacks (as seen in signature-based detection), Behavior-Based IDS can identify new, previously unknown threats and anomalous activities that may not yet have been cataloged. This dynamic approach allows organizations to maintain better security postures against evolving threats and sophisticated attacks that may bypass traditional signature-based methods.

The other options emphasize different security functionalities or techniques that do not align with the primary purpose of a Behavior-Based IDS. For instance, detecting viruses through signature matching pertains to a more static methodology focused on known threats, while blocking unwanted user access and encrypting data in transit address different aspects of cybersecurity that do not relate directly to the behavioral analysis that Behavior-Based IDS employs.