| Principle | Description | Example |
|---|---|---|
| Input Validation | Check data before processing | Age must be 0-120 |
| Input Sanitisation | Clean/remove dangerous characters | Remove < > from text |
| Anticipating Misuse | Plan for incorrect/malicious use | Limit login attempts |
| Authentication | Verify user identity | Username + password |
| Maintainability | Code that's easy to update | Comments, naming, indentation |
This key facts covers Defensive Design Principles within Defensive Design for GCSE Computer Science. Revise Defensive Design in 3.2 Programming for GCSE Computer Science with 15 exam-style questions and 8 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 6 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Defensive Design
What is the purpose of input validation in a program?
Describe three different types of validation check, giving an example of each.
Quick recall flashcards
What is authentication?
Verifying a user's identity before granting access to a system
Why use comments?
To explain code so others can understand and maintain it