AP CK CyberSecurity Unit 3

Which of the following technical controls can be used to verify the integrity of a file?

• DLP software

• Network firewall

• Cryptographic file hash

• Symmetric encryption

A high school teacher has access to their students’ standardized test scores. While emailing a parent, the teacher accidentally attaches an entire class’s test scores to the email.

The IT department at the school has specialized software installed that recognized and stopped the confidential test score files from being transmitted.

What type of specialized software prevented the email transmission?

• DLP software

• Anti-malware software

• IDS software

• Access control software

Which of the following describes the length of a cryptographic hash function output?

• The length of the hash varies depending on the size of the file

• The length of the hash is the same length as the input

• The length of the hash is a fixed length

• The length of the hash is determined by the encryption key

A software development company has released a new version of their most popular application. They published the application on their website along with the following cryptographic hash of the file.

U5FNWtVlOim7oaMGds6y

A user downloads and hashes the application using the same cryptographic hashing algorithm as the software development company. The result is the following hash.

U5FNWtVlOim7oaMGds6y

What is the purpose of checking the file hash as described?

• To verify that the file size is correct

• To confirm that the file has not been tampered with

• To check that the file is compatible with their operating system

• To ensure that the file was only downloaded from the company’s website

You are using a shift cipher with a shift of 5 to send a word to a friend. '“CYBER” is the word you want to send to your friend. What message should you send?

• PLORE

• CBRYE

• HYPER

• HDGJW

Person A wants to send a message to Person B using a pre-defined key.

Person A will send ciphertext to Person B

Person B will be able to decrypt the message using the same key that encrypted it.

What is the appropriate cryptographic algorithm for this situation?

• Symmetric encryption

• Asymmetric encryption

• Cryptographic hash function

• Public key encryption

What is one effect of using a long encryption key?

• It speeds up the encryption process

• It makes it harder for an adversary to guess the correct key

• It reduces the size of the encrypted data

• It ensures the data is more compressed

A person has received a message that was digitally signed. How can that person verify the integrity of the message?

• They use the sender’s private key to decrypt the digital signature to reveal a hash. The receiver then hashes the message and verifies that both hashes match.

• They use a symmetric key to decrypt the digital signature to reveal a hash. The receiver then hashes the message and verifies that both hashes match.

• They use their own private key to decrypt the digital signature to reveal a hash. The receiver then hashes the message and verifies that both hashes match.

• They use the sender’s public key to decrypt the digital signature to reveal a hash. The receiver then hashes the message and verifies that both hashes match.

Why do key exchange algorithms make it easier for entities to communicate using symmetric encryption?

• Key exchange algorithms allow two entities to establish a shared secret key over an unencrypted channel.

• Key exchange algorithms allow two entities to communicate without any encryption.

• Key exchange algorithms allow two entities to exchange public keys over a secure channel.

• Key exchange algorithms allow two entities to verify each other’s identities without encryption.

Which of the following is included in a digital certificate?

• The owner’s private key

• The encryption algorithm used

• The date the certificate expires

• The owner’s physical address