The FBI says the evidence in one country - North Korea
The United States believes that North Korea declared behind the attack cyber Sony Pictures last year, because the hackers "botched" the FBI.
The director of the James Comey's office said the servers of written material group used exclusively by the North Koreans.
Attack in November saw the interview placed briefly on ice, sensitive documents leaks and film society.
Cyber security experts were skeptical of the assertion FBI North Korea was to blame.
Cancel after the decision to temporarily free Sony film was described by US President Barack Obama as a "mistake" Sony has put the film in cinemas and online distributes.
use a proxy
The comedy of the plot revolves around a plan to assassinate the North Korean leader Kim Jong-un.
Pyongyang has denied that behind the cyber-attack, but described as "good works."
In return, the US sanctions against three North Korean organizations and has placed 10 people.
Sanctions are probably the first time the US moved to punish a country for cyber attacks on American society.
The hack has degenerated into a diplomatic crisis
Mr. Comey was addressing delegates at the International Conference on Cyber Security in New York.
He said there was evidence that the pirates had proxy servers are used in an attempt to disguise the origin of the attack, but sometimes neglected to do disclosed, the FBI believes the true situation.
But experts are not convinced that the United States to review their case.
"To be honest, director Comey revealed nothing new," said Brian Honan, a security expert.
"Different IP addresses that have been associated with this attack on a hotel in Taiwan IP addresses in Japan.
"Everyone connected to the IP address of the Internet can be compromised and used by attackers."
2daybbcnews.blogspot.com
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