Which of the following is NOT a method used by adversaries to gather information?

Secure password sharing is not a method used by adversaries to gather information. Instead, it is typically a practice that organizations and individuals might use to protect sensitive data and facilitate secure collaboration. When individuals securely share passwords, they are trying to ensure accountability and limit access to authorized users.

In contrast, the other methods listed are common techniques employed by adversaries to collect information. Phishing attacks involve tricking individuals into giving up sensitive information by masquerading as trustworthy entities, while social engineering techniques exploit human psychology to manipulate individuals into divulging personal or confidential information. Publicly available information refers to data that can be accessed by anyone, such as through social media, public records, and websites, which adversaries can leverage to gather intelligence. Thus, secure password sharing stands apart as a protective measure rather than a method of information gathering.