Network Security Questions

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41.

Digital signature provides ________

A

authentication

B

nonrepudiation

C

both (a) and (b)

D

neither (a) nor (b)

Correct Answer: C

None.

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42.

Digital signature cannot provide ________ for the message

A

integrity

B

confidentiality

C

nonrepudiation

D

authentication

Correct Answer: B

None.

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43.

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

A

integrity

B

confidentiality

C

nonrepudiation

D

authentication

Correct Answer: B

None.

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44.

A digital signature needs a(n)_________ system

A

symmetric-key

B

asymmetric-key

C

either (a) or (b)

D

neither (a) nor (b)

Correct Answer: B

None.

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45.

A witness used in entity authentication is ____________

A

something known

B

something possessed

C

something inherent

D

all of the above

Correct Answer: D

None.

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46.

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

Correct Answer: B

None.

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47.

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)

Correct Answer: B

None.

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48.

. Challenge-response authentication can be done using ________

A

symmetric-key ciphers

B

asymmetric-key ciphers

C

keyed-hash functions

D

all of the above

Correct Answer: D

None.

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49.

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

Correct Answer: A

None.

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50.

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

A

CA

B

KDC

C

KDD

D

none of the above

Correct Answer: B

None.

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