DOD vs Internet scams
The Defense Department continues to battle increasingly sophisticated attacks against its information systems and networks, including significant and widespread attempts to penetrate systems with targeted, socially engineered e-mail messages in a technique known as spear phishing.
According to internal documents and DOD officials, the department has fought back with requirements that users log on to networks with a Common Access Card (CAC) that electronically verifies their identities and digitally signs e-mail messages with the key contained on that card.