From Defense Tech:Professional spies in the service of nation states, businesses, organized crime and terrorist organizations target and steal secret information from the public and private sectors to use and sell. Traditional foreign espionage efforts attack the heart of national security and any country's well-being. Non-traditional espionage efforts attack the competitiveness and prosperity of our businesses. When you add the recent increases in cyber intelligence collection efforts, the threat has risen to unprecedented levels and triggered numerous warnings from experts around the globe. To put this threat in perspective, in the 2008 Top Ten Cyber Security Menaces by the SANS Institute, cyber espionage ranked number three. In order to counter this threat, you need to understand counter intelligence and counter cyber intelligence.
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My Comment: Defense Tech does an assessment on counter cyber intelligence. For those who want a better understanding, this is a good article to read.