Correct Answer: B
Explanation/Reference:
Explanation:
Digital Signatures can be used to provide Integrity, Authentication and Nonrepudiation.
A digital signature is a hash value that has been encrypted with the sender's private key.
If Kevin wants to ensure that the message he sends to Maureen is not modified and he wants her to be sure it came only from him, he can digitally sign the message. This means that a one-way hashing function would be run on the message, and then Kevin would encrypt that hash value with his private key. When Maureen receives the message, she will perform the hashing function on the message and come up with her own hash value. Then she will decrypt the sent hash value (digital signature) with Kevin's public key.
She then compares the two values, and if they are the same, she can be sure the message was not altered during transmission. She is also sure the message came from Kevin because the value was encrypted with his private key. The hashing function ensures the integrity of the message, and the signing of the hash value provides authentication and nonrepudiation.
Incorrect Answers:
A: Digital signatures do not provide Confidentiality or Authorization.
C: Digital signatures do not provide Authorization.
D: Digital signatures do not provide Authorization, Detection or Accountability.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 829