Cousera-usable Security

1. Human-Computer interation-> HCI

How people interact with technology

Three dimensions:

1. User: it can be an old man, a child, a person, a team, etc.

2. task: simple tasks, to complex data analysis

3. Context: even if the user and task are the same, different environments may affect interaction.

 

-> Design & build the system-> evaluation: usable security is used to evaluate whether the system is easy for user to use.

 

2. Usability availability

Measure usability: five dimensions

Speed: the time when the user completes a job. Ignore the error. In the optimal case, the iPhone is identified by fingerprint and the password of the iPhone. The logon time is 1 s and 4.8 s, respectively.

Efficiency: How to prepare mistakes made in one task. An error may occur on the iPhone that enters the password, but fingerprint recognition does not.

Learnability: how easy it is to learn to use a system.

Memorability: once learned, how easy to remember how to use the system. for example, to select a font, you can enter a common font in the font box or select a non-common font from the drop-down list.

User preference: What do users like. This item may be contrary to other projects, such:

 

How to measure:

1. Timing

2. counting errors

3. Measure learnability: for example, it takes 10 seconds for the first user to log on, and the second time is reduced to a very low level.

4 measure memorability: for example, after a long logon, you can log on again to check the time difference from the previous one. Is a good system.

5. measure user preference: standard questionnaire, surveys are used to communicate with users, where improvements are needed.

Cousera-usable Security