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It sure is convenient doing financial, social and personal business online, but increasingly it’s scary too. In recent years, businesses and institutions have been plagued by cybersecurity breaches — putting all our digital information at risk. A data breach is anything that results in unauthorized access of data, networks, applications or services by defeating a security system. Not even political organizations, such as the Democratic National Committee, have been safe from hackers’ intrusions. Here are 20 of the most serious such breaches that have taken place to date.