Internet Security solved MCQs

1 of 4

1. Message_____ means that the data must arrive at the receiver exactly as sent.

a. confidentiality

B. integrity

c. authentication

d. none of the above

2. Message _______ means that the receiver is ensured that the message is coming from the intended sender, not an imposter.

a. confidentiality

B. integrity

c. authentication

d. none of the above

3. A(n) ________function creates a message digest out of a message.

a. encryption

B. decryption

c. hash

d. none of the above

4. The secret key between members needs to be created as a ______ key when two members contact KDC.

a. public

B. session

c. complimentary

d. none of the above

5. The ________ criterion ensures that a message cannot easily be forged.

a. one-wayness

B. weak-collision-resistance

c. strong-collision-resistance

d. none of the above

6. A(n) _____ is a trusted third party that assigns a symmetric key to two parties.

a. kdc

B. ca

c. kdd

d. none of the above

7. A witness used in entity authentication is ____________.

a. something known

B. something possessed

c. something inherent

d. all of the above

8. A _______ message digest is used as an MDC.

a. keyless

B. keyed

c. either (a) or (b)

d. neither (a) nor (b)

9. A(n)______ creates a secret key only between a member and the center.

a. ca

B. kdc

c. kdd

d. none of the above

10. ________ means to prove the identity of the entity that tries to access the system's resources.

a. message authentication

B. entity authentication

c. message confidentiality

d. none of the above

11. A ________ signature is included in the document; a _______ signature is a separate entity.

a. conventional; digital

B. digital; digital

c. either (a) or (b)

d. neither (a) nor (b)

12. If _________ is needed, a cryptosystem must be applied over the scheme.

a. integrity

B. confidentiality

c. nonrepudiation

d. authentication

13. Digital signature provides ________.

a. authentication

B. non-repudiation

c. both (a) and (b)

d. neither (a) nor (b)

14. Digital signature cannot provide ________ for the message.

a. integrity

B. confidentiality

c. non-repudiation

d. authentication

15. To authenticate the data origin, one needs a(n) _______.

a. mdc

B. mac

c. either (a) or (b)

d. neither (a) nor (b)

16. A(n) _________ can be used to preserve the integrity of a document or a message.

a. message digest

B. message summary

c. encrypted message

d. none of the above

17. Challenge-response authentication can be done using ________.

a. symmetric-key ciphers

B. asymmetric-key ciphers

c. keyed-hash functions

d. all of the above

18. The _______criterion ensures that we cannot find two messages that hash to the same digest.

a. one-wayness

B. weak-collision-resistance

c. strong-collision-resistance

d. none of the above

19. A digital signature needs a(n)_________ system.

a. symmetric-key

B. asymmetric-key

c. either (a) or (b)

d. neither (a) nor (b)

20. A(n) ________is a federal or state organization that binds a public key to an entity and issues a certificate.

a. kdc

B. kerberos

c. ca

d. none of the above

21. Message ________ means that the sender and the receiver expect privacy.

a. confidentiality

B. integrity

c. authentication

d. none of the above

22. In ________ authentication, the claimant proves that she knows a secret without actually sending it.

a. password-based

B. challenge-response

c. either (a) or (b)

d. neither (a) nor (b)

23. In _______, a claimant proves her identity to the verifier by using one of the three kinds of witnesses.

a. message authentication

B. entity authentication

c. message confidentiality

d. message integrity

24. The _______ criterion states that it must be extremely difficult or impossible to create the message if the message digest is given.

a. one-wayness

B. weak-collision-resistance

c. strong-collision-resistance

d. none of the above

25. A(n) ______ is a hierarchical system that answers queries about key certification.

a. kdc

B. pki

c. ca

d. none of the above

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