In December, the U.S government blamed North Korea for the cyber attack of Sony Pictures.  The statement infuriated all the government of North Korea.

In the beginning of January, Barack Obama authorized sanction against North Korea.  Government of North Korea asked U.S government to provide evidence for this charge.

James Comey, FBI director said that North Koreans have failed to hide their tracks.  The U.S Internet authorities have gained the IP addresses of the posts and emails of hackers.   North Koreans used such kind of IPs addresses are only

Thus far, group of Sony hackers have attacked nearly majority of the confidential documents of the company. They got hold of salary spreadsheets, top secret emails, pre-release copies of films and much more. They utilized malicious software to break into thousands of computers of the Entertainment Company.

Additionally, the hackers of Sony Pictures threaten the company not to release “The Interview”.  The entire storyline of the film is based upon the assassination of a Supreme leader of North Korea. The threat against “The interview” gave hints about the involvement of North Korea in this matter

Recently, a document of N.S.A indicates that U.S National Security Agency began their hacking efforts in North Korea in 2010. The paper reveals that the U.S spy agency worked really hard to break into the internet networks of North Korea, China and Malaysia.

On the other hand, U.S intelligence officials decline to make any comment on this issue.