Defensive Design

Defensive Design

1. Code

   • minimum Length
   • Maximum Length
   • Required
   • Invalid Duplication

2. Screen Widgets

   • A Hard Coded Menu, Impossible for the user to get Wrong
   • The Calendar widget
     • A Graphic Interface, which the user can select a date, the date is enfcoded and cannnot be invaild or changed
   • Colour Picker Widget
     • allow to select, pre-selected colours, the code will always know what the user will pick

3. Drop down list

   • Drop Down list, allows the user to only selected a certain amount of things it can do

4. Repeat Entry

   • its when the user must input a text like a password and if the user doesn't follow the requirement

5. Input box

   • Checking length of the data
   • Checking the range of the data
   • checking type of Data
   • checking the format of the data

6. sanitising Input

   • Encryption
     • A Database of username and passwords, could be taken or seen by unauthorised person, defensive coding should include encryption to scramble every data record