It is your job to make email safe. Where do you start? In business today the national and global in which business is done in time zones and continents, the "e" in email could stand for "essential." Review how email operates and where vulnerabilities lie Learn the basics of cryptography and how to use it against invaders Understand PKI (public key infrastructure), which can be trusted to perform certain tasks, how PKI architecture works, and how the function certificate Identify ways to protect your passwords, message headers, and command, and the contents of email messages you see different types of device (or "token") that can be used to store and protect private keys