The FBI said the Sony incident "careless" hackers exposed the IP address

U.S. Federal Bureau of Investigation Director James Comey at the Ford University Law School Network Forum, said the FBI has been very certain that the hackers attacked Sony.

Review the whole incident: After Sony was attacked by hackers, North Korea official denied that the hacker issued a terrorist threat, the FBI said it is really complicated to investigate, the Obama strong response, Sony issued a lawyer letter to prohibit the dissemination of leaked documents, and finally to the Sony Christmas Day online "assassination of Kim Jong-un."

Because of the lack of conclusive evidence, the Obama administration has not clearly identified the Sony incident behind the . However, Comey appears to have confidence in the results of the investigation and has revealed some evidence to the media that the hackers sometimes forget to use proxies, exposing their real IP, which all point to North Korea.

An FBI "Behavioral Analysis Team" (some experts who analyze the work and behavior of suspects from a psychological perspective) participated in the Sony incident. At the same time, the FBI found that some time, do not know whether the hackers forget or for technical reasons, they did not use agents, but directly connected to the Internet, so the FBI obtained these from the IP address.

Comey added, "Once they find out they've made a mistake, they'll get off the line quickly, but not before we find out where they came from."

Before that, the FBI claimed that "some of the source code, encryption algorithms, ways to remove data from the attack and the damage to the network were somewhat similar to the previously known cyber attacks from North Korea", a vague statement that provoked criticism.

The Comey statement is still brief and mysterious, and has not responded to various queries raised by reporters. The cyber-security community has asked the FBI for more evidence, and good people have even petitioned the White House website to "call for more transparency". The well-known security blogger Bruce Schneier The FBI's "trust us" in parallel to the Bush administration's comments on the Saddam government's weapons of mass destruction. Because of the lack of information, network experts are also controversial about who is black Sony.

But the Obama administration does not need many reasons, and last week the White House announced that it would impose new sanctions on North Korea. "We have to fight back and they will do the same thing over and over again if they are not punished," said James Clapper, US intelligence director earlier this year.

Comey then came up with a vague response to suspicion, "they [skeptics] don't know what I know, nor do they see what I see." Comey said that, for security reasons, although he himself wanted to give the American people more evidence, but could not let the wrong people know the way the FBI investigation and the resources available.

Comey also hinted that the findings of other intelligence agencies, which have been surveyed by the NSA and the U.S. National Security Agency, also supported their conclusions. "I have rarely been so confident in my life, as the entire intelligence community has been known to have launched an attack," he vowed.

Although Comey is "confident", it is hard for the cyber security community to accept this. Who knows this accidentally leaked "real" IP address is also a premeditated behavior? Perhaps these "real" IP addresses are also disguised by proxy IP.