CyberSecurity & DevSecOps Expert: Develop, PenTest, and Deploy Secure Applications

So far, you have learned to identify an attack surface, to apply security principles, to model threats with STRIDE, and to prioritize risks using the OWASP Risk Rating Methodology. All of this is analytical work. But analysis alone changes nothing ab...

This chapter closes the section on Application Security Principles and Threat Modeling. Its purpose is not to introduce new material, but to assemble everything you have studied into a single coherent mental map. A mental map is a way of representing...

THEORETICAL RECAP Risk scoring turns a vague sense of danger into a comparable number so you can prioritize corrections and tests. The OWASP Risk Rating Methodology models Risk = Likelihood x Impact. Likelihood is estimated from Threat Agent factors ...

In the previous activities, you learned to identify the attack surface of an application, to map threats using the STRIDE model, to apply secure design principles, and to score threats with the OWASP Risk Rating Methodology (probability versus impact...

THEORETICAL RECAP The OWASP Risk Rating Methodology estimates the severity of a threat by combining two dimensions: Likelihood (how probable an attack is) and Impact (the damage it causes). Each dimension is broken into factors scored from 0 to 9. Li...

In the previous activities, you built a threat matrix for the Blog, mapped its attack surface, and applied secure design principles such as Least Privilege and Defense in Depth. You also practiced classifying threats with STRIDE. Now that you can ide...

THEORETICAL RECAP The attack surface is the sum of all points where an unauthorized actor can attempt to enter, extract, or manipulate data within a system. It includes entry points (HTTP endpoints, forms, APIs, file uploads, cookies, headers), data ...

The attack surface is one of the most important concepts in application security and threat modeling. Now that you have practiced drawing Data Flow Diagrams, applying the STRIDE methodology, building threat matrices, and evaluating applications again...

THEORETICAL RECAP Secure design principles are not abstract rules; they are decision filters you apply to concrete features. Least Privilege means every component (service account, container, database user, storage bucket) holds only the permissions ...

In the previous activities, you learned to model threats with STRIDE, to draw Data Flow Diagrams, to build a threat matrix, and to evaluate an application against secure design principles such as Least Privilege and Defense in Depth. This case study ...

THEORETICAL RECAP Secure design principles are foundational rules that guide how an application should be architected to minimize attack surface and contain damage when a component is compromised. The core principles you must know include: Least Priv...

In the previous activities, you learned to identify threats using the STRIDE method, to draw Data Flow Diagrams, and to build a complete threat matrix for a Blog application. Those activities focused on finding and classifying threats. This activity ...

## Project Overview This mini-project is the culmination of the 'Application Security Principles and Threat Modeling' chapter. You will consolidate everything you have practiced so far — components/assets identification, CIA, STRIDE, Data Flow Diagra...

THEORETICAL RECAP Threat modeling connects two artifacts you have already built: the Data Flow Diagram (DFD) and the STRIDE taxonomy. A DFD represents your application as external entities (users, third parties), processes (services, APIs), data stor...

THEORETICAL RECAP A Data Flow Diagram (DFD) is a graphical model that shows how data moves through an application. It relies on four core symbols: external entities (rectangles) representing actors or systems outside your control (users, third-party ...

A Data Flow Diagram, often abbreviated as DFD, is a visual representation of how information moves through an application or a system. In threat modeling, it is the foundation on which everything else is built. Before you can apply STRIDE, identify a...

THEORETICAL RECAP STRIDE is a threat modeling framework that classifies threats into six categories: Spoofing (impersonating an identity), Tampering (altering data or code), Repudiation (denying an action without traceability), Information Disclosure...

THEORETICAL RECAP STRIDE is a threat classification model created by Microsoft that maps six threat categories to the security properties they violate: Spoofing (breaks Authentication), Tampering (breaks Integrity), Repudiation (breaks Non-repudiatio...

The STRIDE method is a structured approach to threat modeling. It was developed at Microsoft to help teams systematically identify the ways an application or system can be attacked. You have already studied why we model threats, how to break an appli...

THEORETICAL RECAP Threat modeling always starts with understanding what you are protecting. Before you can identify threats, you must decompose the application into its components. A component is any distinct part of the system that stores, processes...

Threat modeling is a structured way of thinking about what can go wrong with an application before attackers find out for you. In the previous activities, you learned about assets (things worth protecting), the Confidentiality, Integrity and Availabi...

THEORETICAL RECAP The OWASP Top 10 is a consensus-based, regularly updated list of the ten most critical web application security risks. It is not a checklist of individual bugs but a set of risk categories, each grouping many concrete weaknesses. Th...

The OWASP Top 10 is a reference document published by the Open Worldwide Application Security Project, a nonprofit foundation dedicated to improving software security. This document lists the ten most critical security risks for web applications. It ...

THEORETICAL RECAP The CIA triad describes three security properties every asset can require: Confidentiality (only authorized parties can read the data), Integrity (data cannot be altered or destroyed without authorization or detection), and Availabi...

In the previous activities you learned the essential vocabulary of security — asset, threat, vulnerability, risk — and you explored the three foundational properties of information security: Confidentiality, Integrity, and Availability. You also prac...