By Esteban Israel SAO PAULO (Reuters) – Brazilian hackers are threatening to disrupt the World Cup with attacks ranging from jamming websites to data theft, adding cyber warfare to the list of challenges for a competition already marred by protests, delays and overspending. In a country with rampant online crime, a challenging telecommunications infrastructure and little experience with cyber attacks, authorities are rushing to protect government websites and those of FIFA, soccers governing body. Furious about the 33 billion reais ($14 billion) in federal funds being spent on World Cup preparations, more than a million Brazilians took to the streets last June in a wave of mass demonstrations, calling for better public services, greater transparency, and a crackdown on corruption. We are already making plans, said an alleged hacker who goes by the nom de guerre of Eduarda Dioratto.