Richard Clarke’s credentials are well established, having been a national security advisor to presidents of both parties

“The major shock about the mischievous WikiLeaks—even more than the individual headline items—is that it dramatizes how vulnerable we still are. Digitization has made it easier than ever to penetrate messages and download vast volumes of information. Our information systems have become the most aggressively targeted in the world. Each year, attacks increase in severity, frequency, and sophistication. On July 4, 2009, for instance there was an assault on U.S. government sites—including the White House—as well as the New York Stock Exchange and Nasdaq. There were similar attacks that month on websites in South Korea. In 2008, our classified networks, which we thought were inviolable, were penetrated. Three young hackers managed to steal 170 million credit-card numbers before the ringleader was arrested in 2008.”

From Publishers Weekly
“On today’s battlefields computers play a major role, controlling targeting systems, relaying critical intelligence information, and managing logistics. And, like their civilian counter-parts, defense computers are susceptible to hacking. In September 2007, Israeli cyber warriors “blinded” Syrian anti-aircraft installations, allowing Israeli planes to bomb a suspected nuclear weapons manufacturing facility (Syrian computers were hacked and reprogrammed to display an empty sky). One of the first known cyber attacks against an independent nation was a Russian DDOS (Deliberate Denial of Service) on Estonia. Since it can rarely be traced directly back to the source, the DDOS has become a common form of attack, with Russia, China, North Korea, the U.S., and virtually every other country in possession of a formidable military having launched low-level DDOS assaults. Analysts across the globe are well aware that any future large-scale conflict will include cyber warfare as part of a combined arms effort. Clarke and Knake argue that today’s leaders, though more computer savvy than ever, may still be ignorant of the cyber threats facing their national security.”