producing robust programs

producing robust programs

1. defensive design

   • defensive strategies
   • validation
     • type
     • length
     • format
     • range
     • presence
   • maintainability
     • maintain good working code
     • reducing the chance of introduction coding mistakes / bugs
   • minimising / removing bugs
   • protection against unexpected user inputs
   • testing
     • iterative testing
     • Final testing
     • program functions as it was desigined and meets the needs of the end user
     • types
       • Valid data
       • invalid data
       • Borderline
   • authentication
     • usernames
     • passwords
       • complex passwords
     • acess rights
     • update their passwords regularly
     • limit login attempts