Many of the components used for Windows apps in Visual Basic are defined in namespace:

The purpose of the __________ algorithm is to enable two users to securely reach agreement about a shared secret that can be used as a secret key for subsequent symmetric encryption of messages.

Fill in the blank(s) with the appropriate word(s).

Technically, a ____ is a data structure used in a public key system to bind a particular, authenticated individual to a particular public key.

A. digital certificate B. digital signature C. message digest D. MAC