Week 1 Practice Quiz

Question 1

Cryptography relies upon two basic components: an algorithm and a key.

Answer

true

Question 2

There are two basic types of cryptography:  secret key systems and public key systems.

Answer

true

Question 3

Asymmetric is the only  way to use keys or secrets for encryption.

Answer

true

Question 4

Which key length is considered to have long-term security of several decades unless quantum computer become involved?

Accepted Answer

128 bit

Answer

256 bit

Answer

64 bit

Answer

448 bit

Question 5

This type of attack involves a human component and might also involve bribing, blackmailing, tricking or classical espionage:

Accepted Answer

Social engineering

Answer

Brute-force

Answer

Implementation attack

Answer

Conscious attack

Question 6

One way to obtain a secret key is to use an attribute analysis.

Answer

true

Question 7

Using the clock modular math, what would be the modulus of -7 mod 3 = ?

Accepted Answer

2

Answer

-2

Answer

3

Answer

1

Question 8

Modular math is rarely used in cryptography.

Answer

true

Question 9

Modular math is simply working with the remainder (mod).

Answer

true

Question 10

A block cypher encrypts a fixed size of n-bits of data.

Answer

true

Question 11

It is illegal to copy a DVD you have purchased.

Answer

true

Question 12

A popular substitution cipher is the Caesar Cipher and it is very secure.

Answer

true

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