What Is Threat Modeling?
Threat modeling is a structured way to find security risks in a system's design. The team maps how data flows through the system, identifies where trust changes, asks what could go wrong at each point, and decides how to prevent or detect it. It answers four questions: what are we building, what can go wrong, what will we do about it, and did we do a good job?
This Is For You If...
You're designing a new product, major feature, or architecture
You're adding payments, AI agents, multi-tenancy, or third-party integrations
Security findings keep coming back to design decisions, not bugs
A customer or auditor asks how security is built into your design process
You're moving from a monolith to microservices or a distributed system
STRIDE: The Six Threat Types
Threat | What It Means | Typical Defense |
Spoofing | Pretending to be another user or system | Strong authentication |
Tampering | Changing data or code without permission | Integrity checks and signing |
Repudiation | Denying an action with no way to prove it | Audit logs |
Information disclosure | Exposing data to the wrong people | Access control and encryption |
Denial of service | Making the system unavailable | Rate limits and resilience |
Elevation of privilege | Gaining more access than allowed | Authorization checks and least privilege |
What We Do
System Mapping
Data flow diagrams showing components, data stores, external services, and trust boundaries.
Threat Identification
Workshops with your team using STRIDE, with LINDDUN for privacy risks and MITRE ATT&CK where it helps.
Risk Ranking
Each threat ranked by likelihood and impact, so effort goes where it matters.
Design Fixes
Concrete changes to architecture, authentication, data handling, and integrations. See Distributed Systems.
Security Test Cases
Threats turned into tests for code review, QA, and penetration testing. See Penetration Testing.
Lightweight Process
A repeatable template your team can use for every new feature, without slowing delivery.
Common Mistakes to Avoid
Instinct | Why It Doesn't Help | Do This Instead |
Threat modeling once for the whole product | Systems change with every feature | Model each significant feature or change |
Doing it without the developers | The model misses how things really work | Run it as a short workshop with the builders |
Producing a long document nobody reads | Findings never reach the backlog | Turn every threat into a ticket or test |
Waiting until after launch | Design flaws are expensive to fix later | Model during design, before code is written |
What You Get
Data flow diagrams with trust boundaries
A ranked list of threats
Design changes and mitigations for each high-risk threat
Security test cases for QA and pentesting
Tickets ready for your backlog
A reusable threat modeling template for your team
How It Works
1. Prepare
Review architecture, data, and integrations
2. Map
Draw data flows and trust boundaries together
3. Identify
Find threats with STRIDE in a workshop
4. Prioritize
Rank by likelihood and impact
5. Act
Design fixes, tickets, and test cases
Why Codersarts
We design and build systems as well as secure them, so mitigations are practical and fit your stack and timeline.
Turnaround Time
A threat model for one feature or service takes 2 to 5 working days, including workshops. A full product architecture usually takes 1 to 3 weeks.
FAQ
What is STRIDE?
STRIDE is a threat modeling method from Microsoft that groups threats into six types: spoofing, tampering, repudiation, information disclosure, denial of service, and elevation of privilege.
When should we threat model?
During design, before significant code is written, and again when a feature changes how data or trust flows.
Which tools do you use?
Simple diagrams work well. We also use tools such as OWASP Threat Dragon or the Microsoft Threat Modeling Tool when teams want a shared model.
Do you model AI and LLM features?
Yes. AI agents, RAG systems, and tool integrations add new trust boundaries. See LLM Security & Prompt Injection Testing.
Is our project kept confidential?
Yes. Your data, code, and results stay confidential, and an NDA is available on request.
Related Services
What Could Go Wrong With What You're Building Next?
Find out at the design stage, when fixes are cheap.