Cyber Security: Cryptography - Quiz

Question 1

What is ciphertext?

• Information in human- or machine-readable form
• Information that has been encrypted
• A mathematical process for encrypting information
• A mathematical process for decrypting information

Question 2

How many possible values can an encryption key that is 5 bits long have?

• 5
• 8
• 10
• 16
• 32
• 64

Question 3

Which of the following is a common feature of asymmetric cryptography?

• Very short key lengths are used
• Public keys can be given to anyone who wants to know, e.g. posted on a website
• The key pair can be stored on a key chain server
• Encryption and decryption are faster than symmetric cryptography

Question 4

Which one is the correct statement?

• The SHA-2 hashing algorithm is flawed because two different data items can generate the same hash.
• Collisions can occur in the MD-5 hashing algorithm under certain conditions.
• Hashing can show whether data has changed in transmission and can confirm who the original author was.
• Digital signatures are encrypted using the public key and decrypted using the private key.
• Digital signatures are a good way of transmitting secrets.

Question 5

How can you tell if your connection to a web page is secure? There are two possible answers.

• A closed padlock symbol at the top of your browser window.
• The web page will tell you that it is secure
• The word SSL will appear at the top of your browser window
• The address in your browser window will change from http:// to https://