Question 77

Which of the following is a correct statement concerning digital signature used for e-mails?

a) Digital signature cannot prevent an alteration of e-mail contents, but it can detect an alteration.
b) Digital signature can prevent an alteration of e-mail contents, but does not guarantee the confidentiality.
c) Digital signature guarantees the confidentiality of e-mail contents, but cannot prevent an alteration.
d) Digital signature guarantees the confidentiality of e-mail contents, and restores altered e-mail contents as well.

answer