How Does Encryption Software Work

Multiple Choice

How does encryption software work?

A) By intercepting and reviewing e-mail before delivering it to the proper address
B) By looking for signatures of known viruses and virus-like characters
C) By acting as a traffic switch and determining which route the message should take
D) By scrambling messages for anyone who does not have the key to decoding
E) By blocking suspicious messages where the internal network and the Internet meet