“This may well turn out to be a watershed in terms of widespread awareness of the vulnerability of modern society,” said Linton Wells II, the principal deputy assistant secretary of defense for networks and information integration at the Pentagon. “It has gotten the attention of a lot of people.”
The authorities anticipated there would be a backlash to the removal of the statue, which had become a rallying point for Estonia’s large Russian-speaking minority, particularly as it was removed to a less accessible military graveyard.
When the first digital intruders slipped into Estonian cyberspace at 10 p.m. on April 26, Mr. Aarelaid figured he was ready. He had erected firewalls around government Web sites, set up extra computer servers and put his staff on call for a busy week.
By April 29, Tallinn’s streets were calm again after two nights of riots caused by the statue’s removal, but Estonia’s electronic Maginot Line was crumbling. In one of the first strikes, a flood of junk messages was thrown at the e-mail server of the Parliament, shutting it down. In another, hackers broke into the Web site of the Reform Party, posting a fake letter of apology from the prime minister, Andrus Ansip, for ordering the removal of the highly symbolic statue.
Later: A Cyberblockade in Estonia