Internet users around the globe are facing slowed-down service, thanks to what’s being called the biggest cyberattack in history. The prolonged denial-of-service assault is targeting The Spamhaus Project, a European spam-fighting group that has gone after CyberBunker. Security experts say the attack uses more sophisticated techniques than most DDOS (distributed denial of service) attacks and targets the Web’s infrastructure, which has led to other sites performing slowly. “It’s the biggest attack we’ve seen,” Matthew Prince, CloudFlare’s CEO, told CNN.