it security defense against the digital dark arts week 2 answers

Symmetric Encryption

1. What are the components that make up a cryptosystem? Check all that apply.

  • Key generation algorithms
  • Encryption algorithms
  • Transmission algorithms
  • Decryption algorithms

2. What is steganography?

  • The practice of encoding messages
  • The study of languages
  • The study of stegosauruses
  • The practice of hiding messages

3. What makes an encryption algorithm symmetric?

  • High speed
  • Very large key sizes
  • Different keys used for encryption and decryption
  • The same keys used for encryption and decryption

4. What's the difference between a stream cipher and a block cipher?

  • Stream ciphers can’t save encrypted data to disk.
  • Stream ciphers encrypt data as a continuous stream, while block ciphers operate on chunks of data.
  • Block ciphers are only used for block device encryption.
  • There is no difference.

5. True or false: The smaller the encryption key is, the more secure the encrypted data is.

  • TRUE
  • FALSE

6. Which of the following do asymmetric cryptography systems provide? Select all that apply.

  • Confidentiality
  • Availability
  • Authenticity
  • Non-repudiation

7. What advantage does asymmetric encryption have over symmetric encryption?

  • They have very fast performance.
  • They allow secure communication over untrusted channels.
  • They’re more secure.
  • They’re easier to implement.

8. What's a common application for asymmetric algorithms?

  • Full disk encryption
  • Secure password storage
  • Secure key exchange
  • Random number generation

9. What do we call a bit of information that allows authentication of a received message?

  • Asymmetric encryption
  • RSA
  • Symmetric encryption
  • MAC (Message Authentication Codes)

10. Which form of encryption does the US NEST recommend?

  • NSA
  • DSA
  • EC
  • DH

11. How is hashing different from encryption?

  • Hashing operations are one-directional.
  • It is less secure.
  • It is faster.
  • Hashing is meant for large amounts of data while encryption is meant for small amounts of data.

12. What is a hash collision?

  • When two different files generate the same hash digest.
  • When a hash digest is reversed to recover the original.
  • When two identical files generate different hash digests.
  • When two different hashing algorithms produce the same hash.

13. How is a Message Integrity Check (MIC) different from a Message Authentication Code (MAC)?

  • A MIC only hashes the message while a MAC incorporates a secret key.
  • They’re the same thing.
  • A MAC requires a password while a MIC does not.
  • A MIC is more reliable than a MAC.

14. How can one defend against brute-force password attacks? Check all that apply.

  • Incorporate salts into password hashing.
  • Run passwords through the hashing function multiple times.
  • Enforce the use of strong passwords.
  • Store passwords in a rainbow table.

15. ______ is a type of function or operation that takes in an arbitrary data input and maps it to an output of a fixed size, called a hash or a digest.

  • Phishing
  • A hash function
  • Cryptography
  • Secure key exchange

16. Which three of these pieces of information does a digital certificate contain?

  • Identifying information of the certificate owner
  • Public key data
  • Private key data
  • Digital signature

17. Which type of encryption does SSL/TLS use?

  • Neither
  • Both
  • Asymmetric encryption
  • Symmetric encryption

18. Which two of these are functions a TPM (Trusted Platform Module) can perform?

  • Define the creation, storage, and distribution of digital certificates
  • Malware detection
  • Data binding and sealing
  • Remote attestation

19. Which of these is a system that defines the creation, storage, and distribution of digital certificates?

  • PKI
  • CA
  • DSA
  • SHA-3

20. Which of these is a mechanism that lets you remotely connect a network or host to an internal private network while passing data over a public channel?

  • IPsec
  • L2TP
  • VPN
  • PGP

21. Plaintext is the original message, while _____ is the encrypted message.

  • ciphertext
  • algorithm
  • digest
  • cipher

22. The specific function of converting plaintext into ciphertext is called a(n) ______.

  • integrity check
  • encryption algorithm
  • permutation
  • data protection standard

23. Studying how often letters and pairs of letters occur in a language is referred to as _______.

  • frequency analysis
  • codebreaking
  • espionage
  • cryptography

24. The practice of hiding messages instead of encoding them is referred to as ______.

  • obfuscation
  • hashing
  • encryption
  • steganography

25. ROT13 and a Caesar cipher are examples of _______.

  • substitution ciphers
  • asymmetric encryption
  • digital signatures
  • steganography

26. DES, RC4, and AES are examples of ______ encryption algorithms.

  • symmetric
  • weak
  • asymmetric
  • strong

27. Which of the following are necessary components for encryption and decryption operations when using an asymmetric encryption system? Check all that apply.

  • Public key
  • Random number generator
  • Digest
  • Private key

28. To create a public key signature, use the ______ key.

  • public
  • private
  • decryption
  • decryption

29. Using an asymmetric cryptosystem provides which of the following benefits? Check all that apply.

  • Non-repudiation
  • Confidentiality
  • Hashing
  • Authenticity

30. If two different files result in the same hash, it is referred to as a ________.

  • key collision
  • hash collision
  • coincidence
  • mistake

This Post Has 2 Comments

  1. Zee Reply

    please correct question 18… the answer should also include “Remote attestation”

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