Instructions : Circle T if the statement is true, F if the statement is false, or write the best answer in the space provided. A ____________can be added to a file or an e-mail message to verify the...

Instructions: Circle T if the statement is true, F if the statement is false, or write the best answer in the space provided.

A ____________can be added to a file or an e-mail message to verify the identity of the sender and guarantee the file or message has not been changed.