The FREE Cybersecurity Glossary by Thor Pedersen!

AAA Server: A server that provides authentication, authorization, and accounting services for network devices and users. An AAA server is a network security device that controls access to a network by verifying the identity of a user or device and granting or denying access based on predefined policies. It is commonly used in enterprise networks to control access to resources and track user activity.

Abend: Stands for abnormal end. It refers to an unexpected termination of a program or system due to an error or bug. It is commonly used in the context of computer systems and software development to refer to a crash or failure.

Abstraction: A fundamental concept in computer science that involves managing complexity by hiding unnecessary details from the user. Abstraction enables users to interact with systems and applications through simplified models without needing to understand the underlying complex workings.

Abuse Case Testing: A testing methodology where scenarios are developed to anticipate and examine potential misuse or malicious behavior against a system. It aims to uncover potential vulnerabilities or flaws that might not be detected through traditional use case testing, which typically focuses on expected and correct usage. By considering the system from an adversary's perspective, it's possible to enhance the system's defenses against illegitimate usage or attacks.

Acceptable Interruption Window: This refers to the maximum time period during which a system or service can be down without causing unacceptable harm to the operations or the business. It is a key factor in disaster recovery and business continuity planning, as it helps to set the recovery time objective (RTO). Understanding the acceptable interruption window is crucial for managing downtime risks and ensuring appropriate investment in preventative and recovery measures.

Acceptable Use Policy: A policy that defines the acceptable behaviors and actions of users when interacting with a network or system. It typically outlines user responsibilities, prohibited activities, and potential consequences for violations. The policy serves as a guideline for proper and respectful use of resources, and it helps protect the network, its users, and the organization from potential legal issues, security breaches, or reputation damage.