1. CS3240: Adv. SW Dev. Refactoring and Maintenance

2. Where we’re heading Towards “the end”, of course
Towards maintenance and evolution, to be precise

3. Design Tradeoffs Design:
Identifying alternative solutions that meet the requirements
Analyzing these solutions and choosing one, based on… what?
Will it work? (Of course)
???

4. Design Tradeoffs Design:
Identifying alternative solutions that meet the requirements
Analyzing these solutions and choosing one, based on… what?
Will it work? (Of course)
Efficiency
Flexibility, maintainability
Security
Usability
Others?

5. Design Tradeoffs and OneDir
Being agile, we didn’t do a formal design doc
Did you design? Somehow, somewhere
Class activity:
Groups of 2 or 3, with team members if possible
Discuss some design alternatives you saw as you built OneDir
Think about why you made a design choice
What SW design principles guided (or in retrospect) might have guided your choice
Consequences for your final design?
Turn in: Brief discussion on these points for one good example among your group’s experience
One piece of paper per group, with everyone’s name and ID

6. SW Security: An Overview

7. Security CIA: Confidentiality, Integrity, Availability Confidentiality
Making sure data only viewable by authorized users
Integrity
Ensuring accuracy and consistency of data over its entire life-cycle
Availability
Data and services are available when needed, avoiding single points of failure, etc.

8. Confidentiality Data at rest, data in transit Encryption
Authentication
Authorization
Your implementation of OneDir?
Vulnerabilities
Risk modeling, threat assessment

9. Integrity
Hashing
Consistency