There are millions of hackers out there that could compromise these interconnected systems. We have sacrificed security for efficiency" Cyber-espionage Cyber espionage is becoming the weapon of choice for many national governments – no matter how tight-lipped they may be about any involvement in such activities to undermine their enemies. As Nesbitt said, "the next world war will be fought on a keyboard," and we should expect cyber espionage attacks to increase in frequency in 2015, McAfee's "2015 Threat Predictions" report warned.