Module 3: Fundamentals of Cryptography

Aaliyah wants to send a message to a friend, but she does not want anyone else to know that she is communicating with them. Which technique would she use?

b. steganography

Zeinab has been asked by her supervisor to speak with an angry customer who claims that they never received notification of a change in the terms of service agreement. Zeinab learned that an automated "read receipt" was received, showing that the customer opened the email with the new terms of service outlined. What action will Zeinab now take regarding this customer?

d. nonrepudiation

Which of the following is NOT a form of obfuscation?

b. ciphering

Which of the following is NOT correct about "security through obscurity"?

d. It should only be used as a general information security protection in extreme circumstances.

Layla has encrypted a document so that it can only be viewed by those who have been provided the key. What protection has she given to this document?

a. confidentiality

Which of the following is NOT correct about a one-time pad (OTP)?

d. It requires a cipher disk.

What is data called that is to be encrypted by inputting it into a cryptographic algorithm?

a. plaintext

Which of the following creates the most secure ciphertext?

d. sponge function

Karyme needs to select a hash algorithm that will produce the longest and most secure digest. Which would she choose?

d. Whirlpool

Which algorithm uses the same key to both encrypt and decrypt data?

d. symmetric cryptographic algorithm

Which of the following is NOT to be decrypted but is only used for comparison purposes?

a. Digest

Which of these is NOT a characteristic of a secure hash algorithm?

a. Collisions may occur but they should be rare.

Which of the following is a weakness of RSA?

c. As computers become more powerful, the ability to compute factoring has increased.

Which of these is NOT true about ECC?

d. It uses both sloping curves and prime numbers.

If Bob wants to send a secure message to Alice using an asymmetric cryptographic algorithm, which key does he use to encrypt the message?

b. Alice's public key

Farah needs to encrypt only a few files and does not want the entire disk contents to be encrypted. What type of encryption would she use?

a. file-level encryption

Which type of encryption would protect all data on a hard drive, including the installed OS?

a. FDE

What is a collision?

a. Two files that produce the same digest.

Nahla has been asked to make a recommendation about the most secure TEE. Which of the following would she choose?

c. TPM

Which type of blockchain can anyone join?

d. Public blockchain