All five voting systems used in Ohio, a state whose electoral votes narrowly swung two elections toward President Bush, have critical flaws that could undermine the integrity of the 2008 general election, a report commissioned by the state's top elections official has found. It was worse than I anticipated," the official, Secretary of State Jennifer Brunner, said of the report. "I had hoped that perhaps one system would test superior to the others." At polling stations, teams working on the study were able to pick locks to access memory cards and use hand-held devices to plug false vote counts into machines. At boards of election, they were able to introduce malignant software into servers. Ms. Brunner proposed replacing all of the state's voting machines, including the touch-screen ones used in more than 50 of Ohio's 88 counties. She wants all counties to use optical scan machines that read and electronically record paper ballots that are filled in manually by voters. Florida, another swing state with a history of voting problems, is also scrapping touch-screen machines and switching to optical scan ones for the election. Such systems have gained favor because experts say they are more reliable than others and, unlike most touch screens, they provide a paper trail for recounts. The study released Friday found that voting machines and central servers made by Elections Systems and Software; Premier Election Solutions, formerly Diebold; and Hart InterCivic were easily corrupted. The $1.9 million federally financed study assembled corporate and academic teams to conduct parallel assessments. "All of the studied systems possess critical security failures that render their technical controls insufficient to guarantee a trustworthy election," the team wrote.