Security Boundaries A security boundary is the line of separation between two areas, subnets, or environments with differing security requirements. One of the most common examples is the boundary between a local area network (LAN) and the internet....

Defense in Depth Defense in depth, also known as layering, is the practice of using multiple security controls in a series to protect against a variety of threats. A multilayered solution ensures that even if one control fails,...

The five core elements of security—Identification, Authentication, Authorization, Auditing, and Accountability (AAA)—represent the processes that ensure the secure access and operation of a system. These processes are vital to the integrity and functionality of any security system. Identification...

An interesting security concept is the DAD Triad, which represents the failures of the CIA Triad. The DAD Triad consists of Disclosure, Alteration, and Destruction, which occur when security protections in the CIA Triad fail. Disclosure happens when...

Security management concepts and principles are inherent elements in a security policy and solution deployment. These concepts define the basic parameters needed to establish a secure environment. They also outline the goals and objectives that policy designers and...