Skepticism over North Korea's role in the Sony Pictures hack is starting to mount up, as more security researchers and experts claim the evidence provided by the FBI is not sufficient.

The Obama Administration confirmed a connection between the communist state and the #GOP hacking group, but did not disclose the evidence, claiming the agency's "need to protect sensitive sources and methods."

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Analysing the evidence presented by the FBI, alongside data from the malware attack, security experts claim the evidence is far from conclusive, and the U.S. officials should give the private evidence to certain groups, in order to verify the validity of the U.S. claims.

Attributing a source to a cyber attack is always difficult, especially when the attack was sent from various locations around the world. The attack code was written in Korean and shares similarities with another South Korean attack in 2013, but security experts do not see this as conclusive, considering attack code can be bought and sold online.

The U.S. government has also been quick to bundle the #GOP's goals with North Koreas - to see the removal of "The Interview" from U.S. theaters - however a look back at the start of the hacking shows the #GOP did not mention "The Interview" until it become a public debate.

Taia Global, a communication linguistics group, also claim after deciphering the language used by the #GOP group, it is more likely to be a Russian based organisation.

There is also the matter of Sony Pictures internal sources helping the hacking group. In the malware, security experts found logins and passwords, confirming a long attack in the making, or an internal source helping the hackers.

Some security experts believe the attack was orchestrated internally, which would make sense considering the apparent job cuts coming to Sony Pictures in the next few months.

The U.S. has not labelled countries for cyber attacks often, and even when it does harsh punishment is not enacted. Iran, China and Russia have all reportedly hacked into U.S. companies in the past, to attain information, but the U.S. has not put them on the state-terrorist list.

It seems odd that now North Korea has been linked to the #GOP group, the U.S. is willing to put the country on the state-terrorist list, without even fully disclosing the evidence behind the connection.

TagsGOP, Sony Pictures, North Korea, U.S. Government, Barack Obama, FBI