Targeted cyberattacks pose a more immediate threat to sensitive data than a full-fledged cyberwar. They’re also an “existential threat” to the U.S., a top FBI official said last week. The attacks typically rely on sophisticated social engineering techniques to exploit previously unknown security vulnerabilities. Most attacks use social engineering to trick people with access to key information into opening tainted e-mails or other communications. Keeping a close eye on network traffic can help detect anomalies and respond quickly, a researcher says.”]