What does "security-in-depth" refer to?

"Security-in-depth" refers to a layered approach to security in which multiple measures are implemented to protect sensitive information from various threats. This strategy is crucial because relying on a single security measure can leave gaps that might be exploited by adversaries. By having multiple layers, such as access controls, encryption, employee training, and physical security, organizations can ensure that if one measure fails, others are in place to provide continued protection.

This comprehensive strategy not only enhances security but also addresses different potential vulnerabilities. For instance, technical measures might defend against cyber threats, while administrative procedures can ensure that personnel are well-informed about security policies. The combination of these layers creates a more robust security posture, thereby reducing the likelihood of unauthorized access or data breaches.

The other choices do not accurately capture the essence of "security-in-depth." A single barrier would be inadequate for protecting sensitive information, as it creates a single point of failure. Describing it as an outdated method is misleading, as it remains relevant and effective in modern security practices. Lastly, framing it as a security measure only for physical assets fails to account for the digital measures that are also vital in a comprehensive security strategy.