Cyber Security Fundamentals Quiz

In the Vigenère cipher, how is each character in the plaintext encrypted?

• By reversing the plaintext

• By a fixed shift value

• By using a key letter to determine the shift

• By shuffling the characters randomly

Which mode of block cipher operation encrypts identical plaintext blocks to identical ciphertext blocks?

• Cipher Block Chaining (CBC)

• Electronic Code Book (ECB)

• Cipher Feedback (CFB)

• Output Feedback (OFB)

In asymmetric encryption, which key is used to decrypt the message?

• Shared key

• Private key

• Symmetric key

• Hash key

Which of the following ciphers encrypts plaintext in two-letter pairs?

• Caesar cipher

• Vigenère cipher

• Hill cipher

• Playfair cipher

Which property is violated if an attacker successfully modifies a message in transit without detection?

• Confidentiality

• Integrity

• Authentication

• Nonrepudiation

What is the main security risk if the Initialization Vector (IV) in CBC mode is reused or predictable?

• It increases encryption speed

• It causes loss of message integrity

• It allows attackers to identify patterns in ciphertexts

• It makes decryption impossible

In the RSA algorithm, what is the purpose of Euler's totient function φ(n)?

• It determines the block size for encryption

• It ensures the encrypted message is random

• It is used to calculate the private key so that decryption is possible

• It provides a hash value for the key

In the context of cyber resilience, what does the 'Transition' phase focus on?

• Designing appropriate controls and assigning authorities

• Developing plans for recovery after an incident

• Testing controls and refining incident detection

• Identifying critical assets and risk assessment

Which of the following is NOT part of the NIST CSF Core structure?

• Functions

• Controls

• Categories

• Sub-categories

Which of the following BEST describes a key threat vector in supply chain attacks?

• Misconfigured Wi-Fi routers in home offices

• Exploitation of trust relationships with third-party vendors

• Failure to install operating system updates regularly

• Use of strong encryption on internal file servers