What is one way to confirm an organization's security measures through passive means?

To confirm an organization's security measures through passive means, examining public DNS records is an effective approach. Public DNS records provide vital information about an organization's internet domain, including details about domains, IP addresses, and the configurations used. This kind of analysis allows you to gather insights into how the organization has structured its domain names, mail servers, and security configurations without actively probing their systems.

By reviewing these records, you can identify potential points of exposure, such as misconfigured DNS settings or outdated records, which might reveal weaknesses in their security posture. This method does not interfere with the organization's operations or security, making it a passive approach to assessing their security measures.

Other methods, such as conducting penetration tests or performing zone transfers, involve active engagements with the target systems, which can alert the organization to your probing activities and may be considered intrusive. While reviewing third-party business reports can provide an overview of an organization’s security posture, it does not directly assess their current measures and vulnerabilities as effectively as examining public DNS records.