1.3.1 Compression, Encryption and Hashing

Question 1

What name is given to the public and
private keys used in asymmetric
encryption?

Answer 1

Key pair

Question 2

Name the two categories of
compression

Answer 2

Lossy and lossless

Question 3

In which type of compression is the
quality of a file not degraded?

Answer 3

Lossless

Question 4

What is the purpose of encryption?

Answer 4

To keep data secure during transmission

Question 5

Name one type of lossless compression

Answer 5

One from:
1. Run length encoding
2. Dictionary encoding

Question 6

In which form of encryption do the
sender and receiver share the same
private key?

Answer 6

Symmetric encryption

Question 7

How many keys are used in asymmetric
encryption?

Answer 7

Two (one public and one private)

Question 8

If person A wants to send a message to person B
using asymmetric encryption, which key should
they use to encrypt the message?
A: A’s public key
B: A’s private key
C: B’s public key
D: B’s private key

Answer 8

C: B’s public key
A message encrypted with B’s public key can only be
decrypted with B’s private key, which only B has access to