... but how in charge is he now? KCNA KCNA/Reuters A whirlwind of speculation has surrounded North Korea within the past month as the country's leader Kim Jong-Un has not been seen in public since Sept. 3.

Separating truth from fiction in North Korea can be incredibly difficult. The country tries to maintain total secrecy as to its inner political workings, and its leadership is an almost-total black box.

However, the general trend of information from the past month signals that something might be going on inside North Korea, even if no one's sure of what. Some are speculating that supreme leader Kim Jong-Un may have been the victim of an internal coup. Gordon G. Chang of The Daily Beast has outlined a number of pieces of evidence that North Korea might be undergoing major shifts in its political order.

On the other hand, an unnamed US official, speaking to Reuters, said there was no indication that anything unusual was underway in North Korea.

In any case, here are the key arguments that the media is citing to support this conclusion.

1. North Korea's Capital Is In Lockdown

Pyongyang, North Korea's capital, has been reportedly locked down since Sept. 27. This lockdown is a general travel ban preventing anyone from entering or leaving the capital, although it also applies to citizens of the city.

In a coup scenario, the lockdown could either be an attempt to prevent possible defectors or coup plotters from fleeing the city after an unsuccessful attempt, or it could be a move by the putschists to impose order after successfully seizing control.

It is also possible that there's no coup at all, and that the lockdown signals that something else is afoot, like a further purge of officials whom Kim finds disloyal.

A station in the Pyongyang Metro. Benjamin Mack

2. Kim Jong-Un Has Not Been Seen For Over A Month

Kim Jong-Un, the supreme leader of North Korea, has not been seen in public since the start of September. North Korean state media has chalked his absence up to health concerns. A video in July and another video in September showed Kim walking with a limp. It is also thought that the leader might be suffering from gout, due to his preference for strong alcohol and fatty food.

The rather heavyset Kim has also been spending an awful lot of time on his feet lately; one South Korean media report says the Supreme Leader has been undergoing surgery for resulting ankle fractures.

There's at least one sign the health rumors might be causing confusion or unrest inside of North Korea, or that the country's leadership realizes it may have a situation on its hands: On Sunday, senior North Korean officials reversed course and said there was no problem with Kim's health.

3. Kim Missed One Of The Country's Biggest Annual Events

Kim, ostensibly because of health issues, failed to attend last month's meeting of the Supreme People's Assembly. This was the first such assembly that he has skipped since taking power in 2011.

But that's not all. The assembly's official minutes curiously failed to mention Kim Jong-Un until the very end of the document. This could be interpreted as proof of the Supreme Leader's tenuous grip on power.

Then again, both Kim's father and grandfather did not always attend the assemblies, and his absence alone does not necessarily hint at political turmoil.

North Korea's Hwang Pyong So, left, a senior aide to North Korea's supreme leader Kim Jong Un, attends the closing ceremony of the 17th Asian Games at the Incheon Asiad Main Stadium on Saturday. Jason Reed/Reuters

4. North Korean Officials Visited South Korea Unannounced

A high-ranking delegation of North Korean officials that included what are considered to be the Hermit Kingdom's second and third in charge paid a surprise visit to South Korea on Saturday. The visit was the first such high-level talk between officials from the two countries in years. It might even have been the "most senior" northern delegation ever to visit South Korea.

Yet Andrei Lankov, a North Korean scholar who teaches in Seoul, told The Washington Post that this could be part of an ongoing North Korean "charm offensive" that is meant to distance the North from excessive Chinese influence. It doesn't automatically indicate any changes in Pyongyong, at least not on its own.

5. There Are Rumors Of Increasing Dissent

The South Korean newspaper Chosun Ilbo reported in July that officials and soldiers throughout North Korea were becoming increasingly restive under Kim Jong-Un. Officials are apparently openly criticizing Kim or disagreeing with his policies, something that would have been unthinkable under Kim's father or grandfather.

6. Kim Has Carried Out Frequent Purges

Since taking control of the country, Kim is estimated to have purged half of the top 218 military and regime officials within North Korea. He has also changed his army chief three times in 15 months. All of this points to a possible lack of legitimacy and support for Kim's rule — or possibly the relatively new leader's deep mistrust of his top officers.

Either way, Kim changed the military order as many times during his first two years in power as his father, Kim Jong-Il, had done during his 17 years in control.

Kim even purged a close member of his own family. In December 2013, Kim had his uncle Jang Song Thaek executed. Jang was Kim's second in command and regent, the official responsible for overseeing Kim's transition to power.

Jang's purge could signal Kim's desire to exercise total rule and put an end to a period of behind-the-scenes competition between powerful personalities in the North.

Kim Jong-Un with North Korean navy officers — possibly during better days. KCNA/Reuters

7. A Prominent Defector Says Kim Is A Figurehead

Jang Jin-sung, a former key member of the late Kim Jong-Il's propaganda machine and a prominent North Korean defector, has asserted that North Korea has been in the midst of a political upheaval for a while now. According to Jang, the Organization and Guidance Department, a group of elite officials created by Kim Jong-Il, has seized power and is using Kim Jong-Un as a figurehead.

But the claim has no outside confirmation.

Given that North Korea is essentially a black box, it is easy to jump to conclusions on the health and stability of the regime. Taken in total, these points seem to hint that something big is underway in the Hermit Kingdom. They could just as easily add up to nothing.

But as with most other things North Korea-related, there's little way of knowing for sure. There's a long history of predicting changes in North Korea that don't actually end up happening. And in January, political scientist Jay Ulfelder forecast that North Korea belonged in the same category of coup risk for the coming year as the United States or Canada. The Hermit Kingdom's decades of rock-solid autocracy, and lack of recent coup attempts or civil wars informs against the potential for a surprise shakeup in leadership, according to Ulfelder's model.

Armin Rosen contributed to this report.