HCI, Concurrency, Cryptography

Question 1

HCI

Answer 1

Human computer interaction

• the study of the interactions between people and computer interfaces
• the process of designing and building software that is usable, useful, and enjoyable

Question 2

Interface

Answer 2

A boundary where two systems, subject, things meet to exchange information

Question 3

Consequences of bad design

Answer 3

Decreased adoption
Decreased productivity
Data loss

Question 4

Interaction design process

Answer 4

1. Requirements gathering
2. Conceptual design
3. Concrete design
4. Evaluation
5. Repeat

Question 5

Interaction model

Answer 5

An interaction model is a set of principals, rules and properties that guide the design of an interface. It describes how to combine interaction techniques in a meaningful and consistent way

Question 6

Direct manipulation

Answer 6

Offer the satisfying experience of operating on visible objects. The computer becomes transparent and users can concentrate on their tasks

Question 7

Instrumental interaction

Answer 7

Interaction between the physical world through tools

-model based on how we use tools

Question 8

Domain objects

Answer 8

Are objects of interest

Question 9

Interaction instruments

Answer 9

Manipulate the domain objects

Question 10

Degree of indirection

Answer 10

Measure of spatial and temporal offset between the domain object and the instrument

Question 11

Degree of integration

Answer 11

Ratio between the number of degrees of freedom between the instrument and the input device

Question 12

Degree of compatibility

Answer 12

Measures the similarity between the physical actions of the user on the instrument and the response of the object

Question 13

Go

Answer 13

A language developed by google for dealing with concurrency

Question 14

Consensus family

Answer 14

Properties

• consistency: agree to something all the same value
• validity: the value was one proposed by the group
• termination: there will be a finite number of messages

Question 15

FLP theorem

Answer 15

• fisher lynch and Patterson
• if messages are unordered, communication is unbounded, and processes and networks can fail, there is no guest fee a distributed system can come to consensus

Question 16

Cryptography

Answer 16

Is used to hide information from unauthorized parties by making it unintelligible

Question 17

Encryption

Answer 17

Uses some algorithm to transform plaintext into ciphertext

Question 18

Decryption

Answer 18

Reverses the algorithm to turn ciphertext into plaintext

Question 19

Caesars cipher

Answer 19

Very early encryption algorithm
Said to have been used by Julius Caesar
Shift every letter in the alphabet over by a certain number of spaces

Question 20

Vigenere cipher

Answer 20

• overcomes some of the problems with the the Caesar cipher by using more complex key
• instead of just a number , it uses a word