A backdoor is a method that allows an unauthorized user to access a system or network without the permission or knowledge of the owner. A backdoor can be installed by exploiting a software vulnerability, by using malware, or by physically modifying the hardware or firmware of the device.
A backdoor can be used for various malicious purposes, such as stealing data, installing malware, executing commands, or taking control of the system.

Privacy is control over your data. An NDA doesn't necessarily enforce anything. Anyone can still blab. However, if you're geofencing, folks can only access it from the specified area(s). That's enforcing control.

The Diamond Model of Intrusion Analysis focuses on understanding the relationships between the adversary, their capabilities, infrastructure, and victim. It provides a structured approach to examining how attackers exploit information assets.