Five technologies Iran is using to censor the Web

One month after a disputed presidential election sparked widespread unrest in Iran, the country's government has initiated a cyber-crackdown that is challenging hackers across the globe to find new ways to help keep Iranian dissidents connected to the Web. While the government's initial efforts to censor the Internet were blunt and often ineffective, it has started employing more sophisticated tools to thwart dissidents' attempts to communicate with each other and the outside world. Iranian dissidents are not alone in their struggle, however, as several sympathetic hacker groups have been working to keep them online.