Defensive Design

Watch and follow the YouTube video, the lesson contains three parts:

Key Information and content - all you need to do here is watch and listen
Learning activity - there are two activities to complete. One task is a validation matching exercise, the second is a code commenting task, where you are showing understanding of how the input sanitisation works.
Consolidation - these are past exam question and are for deliberate practice to check your understanding.

Defensive Design Full Lesson Video.mp4

Task - Validation Task

Input Sanitisation Task

Exam Questions - Defensive Design

Input sanitisation (1 mark)

...cleaning up input data / removing unwanted data

...by example (e.g. removing special characters / preventing SQL injection)

Validation (1 mark)

• ...checking whether input data should be allowed / is sensible / follows criteria

• ...by example (e.g. goals cannot be less than 0)

Verification (1 mark)

• ... checking whether data has been entered correctly

• ...by example (e.g. double entry / visual check)

Authentication (1 mark)

• ...ensuring only allowed / authorised users can gain access

• ...by example (e.g. usernames /passwords)

Maintainable code (1 mark)

• ...to allow other programmers to understand the code

• ...by example(e.g. comments, indentation, meaningful variable names)

1 mark per bullet max 1

Do not accept "easier to understand"