security Principles
Learn the core principles that guide security practices and decision-making in cybersecurity. This is a foundational concept in information security and ethical hacking that professional developers rely on daily. The explanations below are written to be beginner-friendly while covering the depth and nuance that comes from real-world Cybersecurity experience. Take your time with each section and practice the examples
40 min•By Priygop Team•Last updated: Feb 2026
Defense in Depth
- Multiple layers of security controls — a critical concept in information security and ethical hacking that you will use frequently in real projects
- No single point of failure — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Redundant security measures — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Layered approach to protection — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Compensating controls when primary fails — a critical concept in information security and ethical hacking that you will use frequently in real projects
Least Privilege
- Users get minimum necessary access — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Principle of least privilege access — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Regular access reviews — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Temporary access when needed — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Separation of duties — a critical concept in information security and ethical hacking that you will use frequently in real projects
Fail Secure
- System fails to secure state — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Deny access by default — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Secure configuration on failure — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Error handling without exposure — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Graceful degradation — a critical concept in information security and ethical hacking that you will use frequently in real projects
security by Design
- security built into systems from start — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Secure development lifecycle — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Threat modeling during design — a critical concept in information security and ethical hacking that you will use frequently in real projects
- security requirements definition — a critical concept in information security and ethical hacking that you will use frequently in real projects
- Regular security testing — a critical concept in information security and ethical hacking that you will use frequently in real projects
Security Principles in Practice
Security principles aren't abstract concepts — they are practical guidelines that determine how access control systems are built. Here is how the four core principles translate into real system design decisions.
How Security Principles Guide System Design
- Least Privilege — Access Validation: Before granting any access, the system checks whether the user has explicit permission for that specific resource and action. If no permission exists, access is denied by default — users never receive more access than they need
- Defense in Depth — Multiple Validation Layers: Access requests pass through four sequential checks: (1) Does the user exist? (2) Is the user account active? (3) Does the user have the required permission? (4) Is the target resource available? All four must pass
- Fail Secure — Default Deny: When the system encounters an unknown user, an expired session, or an undefined permission, it defaults to denying access rather than granting it. This ensures that errors and edge cases don't create security holes
- Separation of Duties: Critical operations require multiple approvals — no single user can both initiate and authorize a high-value transaction, preventing both accidents and insider threats