Quiz 1

point

1. Question 1

What is the goal of A/B testing?

To allow users to choose interface options from a menu

To test users' answers to quiz questions

To create software and release it in version A, refine and release version B, and so on

To compare the performance two (or more) interface variations

Question 2

1 point

2. Question 2

What is a heuristic evaluation?

Analyzing a system according to a set of guidelines for good usability.

Having users test a system with low-tech paper prototypes

Developing a description of an example user and thinking about how he or she might use the system

Presenting a description of a system of a group of representative users

Question 3

1 point

3. Question 3

What is the goal of a usability study?

To test the security of a system

To measure and describe usability of a system for given tasks

To study the theoretical aspects of usability

To develop new measures of usability

Question 4

1 point

4. Question 4

If we ran an experiment to test if password logins were faster than a voice recognition authentication system, what would be required to show passwords were faster?

The users of the password group reported higher satisfaction on surveys than the voice recognition group

Password users remembered their passwords more easily than voice recognition users remembered how to authenticate

Statistical tests showed that the password group logged in significantly faster than the voice-recognition group.

The average login time for password users was lower than for voice recognition users

Question 5

1 point

5. Question 5

Which of the following is not something you would do when running a controlled experiment to evaluate an interface?

Have some people try using the control interface while other people try using the experimental interface

Select average users to test the control interface and expert users to test the experimental interface.

Provide users with training and instructions on how to use the control and experimental interfaces

Have each person in the experiment try both interfaces.

Question 6

1 point

6. Question 6

Qualitative evaluation is intended to:

Understand user experiences and reactions to a design

Time how long it takes a user to complete a task

Measure how well a user remembers the steps required to complete a task

Count the number of errors a user makes when using the system

Question 7

1 point

7. Question 7

Which of the following is NOT a standard observation method

Silent Observer

Constructive Interaction

Assisted Use

Think Aloud

Question 8

1 point

8. Question 8

Why do we conduct usability studies on systems that have already been designed?

Despite their best efforts, designer and developers cannot know exactly how users will interact with their system. A usability study will find previously uncovered errors.

A usability study will show how much users like a system and that can help companies set the price for their software

Users often make ignorant mistakes. A usability study will show areas in which users need better training.

Question 9

1 point

9. Question 9

Which of the following are typical questions to ask on a pre-test questionnaire?

What is your age

What was most challenging about using the interface

What is your highest level of education

How difficult was it to complete task 1

Question 10

1 point

10. Question 10

When conducting a controlled experiment, which of the following is not part of the process

Identify dependent and independent variables

Design and test the experimental protocol

State a lucid hypothesis

Explain to participants what conclusions you hope to draw from the results

Quiz 2

1. Question 1

Which of the followings about physical attacks is incorrect ?

All physical attacks will make damage to the system

All physical attacks will need the help from some tools and/or equipment

Some physical attacks will not leave any tamper trace after attack

Some physical attacks do not need physical access to the system

Question 2

1 point

2. Question 2

Which of the following physical attacks is invasive?

Side channel attacks

Fault generation

Software attacks

Microprobing

Question 3

1 point

3. Question 3

Which of the following non-invasive attacks is passive?

Brute force

Fault injection

Side channel attack

Data remanence

Question 4

1 point

4. Question 4

Which of the following about invasive attacks is true?

Because invasive attacks need to depackage the chip, all invasive attacks will be very expensive.

It is possible to probe into a single bus line and inject data to control bus activity.

When the bus lines are scrambled, the attackers cannot find the bus lines to probe.

With sensor mesh at the top metal layer, we still cannot catch all the invasive attacks.

Question 5

1 point

5. Question 5

Which of the following statements is true for data remanence on SRAM?

Data can be extracted from SRAM after multiple write/erase cycles.

When power up, SRAM's initial value will be random, so no data will leak.

It is possible to freeze data and read it at temperature higher than -20 degree.

When SRAM is powered off, it will lose its stored data, so no information will leak.

Question 6

1 point

6. Question 6

When we use the "iterative exponentiation and modular" method to compute 24(mod 5) , starting from 21 , we will have 21=2(mod 5) ; 22=4(mod 5) ; 42=3(mod 5) ; 32=1(mod 5) . The results we will see are 2, 4, 3, 1. If we use the same method to compute 37(mod 5) , starting from 31 , the results we will see are

3, 9, 27, 81, 243, 729. 2187

3, 4, 1, 2, 0, 2, 1

1, 2, 3, 4, 0, 1, 2

3, 4, 2, 1, 3, 4, 2

Question 7

1 point

7. Question 7

Which of the following decimal to binary conversion is incorrect ?

37 = 101011

207 = 11110011

19 = 10011

25 = 11001

67 = 1000011

1 point

8. Question 8

For e=1001010110, when we compute ae(mod n) with the left to right "square and multiple algorithm (I)", the total number of multiplication (both b*b and b*a) we will do is

Question 9

1 point

9. Question 9

In the slide of "Montgomery Reduction", which one of the following conditions is necessary?

gcd (R,N) = 1

T > N

N is a prime

gcd (T,N) = 1

1 point

10. Question 10

The Montgomery reduction of 25 modulo 109 w.r.t. 128 is (just enter your answer, for example, 6)