Cybersecurity's New Challenges

Steven Bellovin, professor of computer science at Columbia University and a longtime researcher at AT&T Labs, is an expert on networks, security, and why the two don't get along.

In an interview with Wall Street Journal reporter David Bank, Mr. Bellovin discusses new threats from cybercriminals, how easy it is to intercept email, and what can be done to improve computer security.

Mr. Bellovin, who also coauthored "Firewalls and Internet Security: Repelling the Wily Hacker," says the biggest change in recent years is the profit motive for hacking.

You can hear the interview at the URL below: