[Security Brief] - P5 - AAA of Security

The "AAA of Security" refers to three fundamental principles forming the cornerstone of many security frameworks, especially network security. These principles are Authentication, Authorization, and Accounting (sometimes called "Auditing").

Let's delve deeper into each of these principles:

Authentication:

• Definition: Authentication is the process of verifying the identity of a user, system, or device. It ensures that an entity - a user or a system - is who it claims to be.
• Methods: Common methods include usernames and passwords, multi-factor authentication (MFA), biometrics, and digital certificates.
• Example: When you log into your email account, you're asked for a username and password. This process verifies your identity.

Authorization:

• Definition: Once an entity is authenticated, authorization determines what that entity is allowed to do. It defines the permissions and rights an authenticated user or system has within the network or system.
• Methods: Role-based access control (RBAC), access control lists (ACLs), and attribute-based access control (ABAC) are common methods used to implement authorization.
• Example: An employee in the HR department might have authorization to access personnel files, while an employee in another department doesn't.

Accounting (or Auditing):

• Definition: Accounting tracks what the authenticated and authorized user does during a session. It involves collecting and maintaining data on user activities and system events. This data can be analyzed for trends, anomalies, or potential security breaches.
• Methods: Logging user activities, session durations, accessed files, and executed commands. Monitoring software and SIEM (Security Information and Event Management) tools often facilitate this.
• Example: If a data breach occurs, logs can be reviewed to determine who accessed sensitive information when they accessed it, and what they did with it.
  
  These three principles provide a comprehensive framework for securing systems and networks. By ensuring that users are who they say they are (Authentication), granting them appropriate permissions (Authorization), and then monitoring their activities (Accounting), organizations can significantly enhance their security postures and protect sensitive data and resources.

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[Security Brief] - P4 - Risk Appetite
[Security Brief] - P3 - Unsolicited Advertising Messages