Category Archives: Strategic Cyber Warfare

CEPA Article: Russia Won’t Play the Cyber Card, Yet

My article from CEPA (Center for European Policy Analysis). Read the full text following this link. 

In reality, the absence of cyber-attacks beyond Ukraine indicates a very rational Russian fear of disclosing and compromising capabilities beyond its own. That is the good news. The bad news is that the absence of a cyber-offensive does not mean these advanced capabilities do not exist.

From the text.

“The recent cyberattacks in Ukraine have been unsophisticated and have
had close to no strategic impact. The distributed denial-of-service (DDoS) cyber-attacks are low-end efforts, a nuisance that most corporations already have systems to mitigate. Such DDoS attacks will not bring down a country or force it to submit to foreign will. These are very significantly different from advanced offensive cyber weapons. Top-of-the-range cyber weapons are designed to destroy, degrade, and disrupt systems, eradicate trust and pollute data integrity. DDoS and website defacements do not even come close in their effects.

A Russian cyber-offensive would showcase its full range of advanced offensive cyber capabilities against Ukraine, along with its tactics, techniques, and procedures (TTP), which would then be compromised. NATO and other neighboring nations, including China and Iran, would know the extent of Russian capabilities and have effective insights into Russia’s modus operandi.

From a Russian point of view, if a potential adversary understood its TTP, strategic surprise would evaporate, and the Russian cyber force would lose the initiative in a more strategically significant future conflict.

Understanding the Russian point of view is essential because it is the Russians who conduct their offensive actions. This might sound like stating the obvious, but currently, the prevailing conventional wisdom is a Western think-tank-driven context, which in my opinion, is inaccurate. There is nothing for the Russians to strategically gain by unleashing their full, advanced cyber arsenal against Ukraine or NATO at this juncture. In an open conflict between Russia and NATO, the Kremlin’s calculation would be different and might well justify the use of advanced cyber capabilities.

In reality, the absence of cyber-attacks beyond Ukraine indicates a very rational Russian fear of disclosing and compromising capabilities beyond its own. That is the good news. The bad news is that the absence of a cyber-offensive does not mean these advanced capabilities do not exist.”

Jan Kallberg

Ukraine: Russia will not waste offensive cyber weapons

An extract from my latest article at CyberWire – read the full article at CyberWire.

When Russia’s strategic calculus would dictate major cyber attacks.

Russia will use advanced strategic cyber at well-defined critical junctures. For example, as a conflict in Europe unfolded and dragged in NATO, Russian forces would seek to delay the entry of major US forces through cyber attacks against railways, ports, and electric facilities along the route to the port of embarkation. If US forces can be delayed by one week, that is one week of a prolonged time window in Europe before the main US force arrived, and would enable the submarines of the Northern Fleet to be positioned in the Atlantic. Strategic cyber support strategic intent and actions.

All cyber-attacks are not the same, and just because an attack originates from Russia doesn’t mean it is directed by strategic intent.

Naturally, the Russian regime would allow cyber vandalism and cybercrime against the West to run rampant because these are ways of striking the adversary. But these low-end activities do not represent the Russian military complex’s cyber capabilities, nor do they reflect the Russian leadership’s strategic intent.

The recent cyberattacks in Ukraine have been unsophisticated and have had close to no strategic impact. The distributed denial-of-service (DDoS) cyber-attacks are low-end efforts, a nuisance that most corporations already have systems to mitigate. Such DDoS attacks will not bring down a country or force it to submit to foreign will. Such low-end attacks don’t represent advanced offensive cyber weapons: the DDoS attacks are limited impact cyber vandalism. Advanced offensive cyber weapons destroy, degrade, and disrupt systems, eradicate trust and pollute data integrity. DDoS and website defacements are not even close to this in their effects. By making DDoS attacks, whether it’s the state that carried them out or a group of college students in support of Kremlin policy, Russia has not shown the extent of its offensive cyber capability.

The invasion of Ukraine is not the major peer-to-peer conflict that is the central Russian concern. The Russians have tailored their advanced cyber capabilities to directly impact a more significant geopolitical conflict, one with NATO or China. Creating a national offensive cyber force is a decades-long investment in training, toolmaking, reconnaissance of possible avenues of approach, and detection of vulnerabilities. If Russia showcased its full range of advanced offensive cyber capabilities against Ukraine, the Russian tactics, techniques, and procedures (TTP) would be compromised. NATO and other neighboring nations, including China and Iran, would know the extent of Russian capabilities and have effective insight into Russia’s modus operandi.

From a Russian point of view, if a potential adversary understood Russian offensive cyber operations’ tactics, techniques, and procedures, strategic surprise would evaporate, and the Russian cyber force would lose the initiative in a more strategically significant future conflict.

Understanding the Russian point of view is essential, because it is the Russians who conduct their offensive actions. This might sound like stating the obvious, but currently, the prevailing conventional wisdom is a Western think-tank-driven context, which in my opinion, is inaccurate. There is nothing for the Russians to strategically gain by unleashing their full advanced cyber arsenal against Ukraine or NATO at this juncture. In an open conflict between Russia and NATO the Russian calculation would be different and justify use of advanced cyber capabilities.

End of abstract – read the full article at CyberWire.

The War Game Revival

 

The sudden fall of Kabul, when the Afghan government imploded in a few days, shows how hard it is to predict and assess future developments. War games have had a revival in the last years to understand potential geopolitical risks better. War games are tools to support our thinking and force us to accept that developments can happen, which we did not anticipate, but games also have a flip side. War games can act as afterburners for our confirmation bias and inward self-confirming thinking. Would an Afghanistan-focused wargame design from two years ago had a potential outcome of a governmental implosion in a few days? Maybe not.

Awareness of how bias plays into the games is key to success. Wargames revival occurs for a good reason. Well-designed war games make us better thinkers; the games can be a cost-effective way to simulate various outcomes, and you can go back and repeat the game with lessons learned.
Wargames are rules-driven; the rules create the mechanical underpinnings that decide outcomes, either success or failure. Rules are condensed assumptions. There resides a significant vulnerability. Are we designing the games that operate within the realm of our own aggregated bias?
We operate in large organizations that have modeled how things should work. The timely execution of missions is predictable according to doctrine. In reality, things don’t play out the way we planned; we know it, but the question is, how do you quantify a variety of outcomes and codify them into rules?

Our war games and lessons learned from war games are never perfect. The games are intellectual exercises to think about how situations could unfold and deal with the results. In the interwar years, the U.S. made a rightful decision to focus on Japan as a potential adversary. Significant time and efforts went into war planning based on studies and wargames that simulated the potential Pacific fight. The U.S. assumed one major decisive battle between the U.S. Navy and the Imperial Japanese Navy, where lines of battleships fought it out at a distance. In the plans, that was the crescendo of the Pacific war. The plans missed the technical advances and importance of airpower, air carriers, and submarines. Who was setting up the wargames? Who created the rules? A cadre of officers who had served in the surface fleet and knew how large ships fought. There is naturally more to the story of the interwar war planning, but as an example, this short comment serves its purpose.

How do we avoid creating war games that only confirm our predisposition and lures us into believing that we are prepared – instead of presenting the war we have to fight?

How do you incorporate all these uncertainties into a war game? Naturally, it is impossible, but keeping the biases at least to a degree mitigated ensures value.

Study historical battles can also give insights. In the 1980s, sizeable commercial war games featured massive maps, numerous die-cut unit counters, and hours of playtime. One of these games was SPI’s “Wacht am Rhein,” which was a game about the Battle of the Bulge from start to end. The game visualizes one thing – it doesn’t matter how many units you can throw into battle if they are stuck in a traffic jam. Historical war games can teach us lessons that need to be maintained in our memory to avoid repeating the mistakes from the past.

Bias in wargame design is hard to root out. The viable way forward is to challenge the assumptions and the rules. Outsiders do it better than insiders because they will see the ”officially ignored” flaws. These outsiders must be cognizant enough to understand the game but have minimal ties to the outcome, so they are free to voice their opinion. There are experts out there. Commercial lawyers challenge assumptions and are experts in asking questions. It can be worth a few billable hours to ask them to find the flaws. Colleagues are not suitable to challenge and the ”officially ignored” flaws because they are marinated in the ideas that established the ”officially ignored” flaws. Academics dependent on DOD funding could gravitate toward accepting the ”officially ignored” flaws, just a fundamental human behavior, and the fewer ties to the initiator of the game, the better.

Another way to address uncertainty and bias is repeated games. The first game, cyber, has the effects we anticipate. The second game, cyber, has limited effect and turns out to be an operative dud. In the third game, cyber effects proliferate and have a more significant impact than we anticipated. I use these quick examples to show that there is value in repeated games. The repeated games become a journey of realization and afterthoughts due to the variety of factors and outcomes. We can then afterward use our logic and understanding to arrange the outcomes to understand reality better. The repeated games limit the range and impact of specific bias due to the variety of conditions.

The revival of wargaming is needed because wargaming can be a low-cost, high-return, intellectual endeavor. Hopefully, we can navigate away from the risks of groupthink and confirmation bias embedded in poor design. The intellectual journey that the war games take us on will make our current and future decision-makers better equipped to understand an increasingly complex world.

 

Jan Kallberg, Ph.D.

 

A new mindset for the Army: silent running

//I wrote this article together with Colonel Stephen Hamilton and it was published in C4ISRNET//

In the past two decades, the U.S. Army has continually added new technology to the battlefield. While this technology has enhanced the ability to fight, it has also greatly increased the ability for an adversary to detect and potentially interrupt and/or intercept operations.

The adversary in the future fight will have a more technologically advanced ability to sense activity on the battlefield – light, sound, movement, vibration, heat, electromagnetic transmissions, and other quantifiable metrics. This is a fundamental and accepted assumption. The future near-peer adversary will be able to sense our activity in an unprecedented way due to modern technologies. It is not only driven by technology but also by commoditization; sensors that cost thousands of dollars during the Cold War are available at a marginal cost today. In addition, software defined radio technology has larger bandwidth than traditional radios and can scan the entire spectrum several times a second, making it easier to detect new signals.

We turn to the thoughts of Bertrand Russell in his version of Occam’s razor: “Whenever possible, substitute constructions out of known entities for inferences to unknown entities.” Occam’s razor is named after the medieval philosopher and friar William of Ockham, who stated that in uncertainty, the fewer assumptions, the better and preached pursuing simplicity by relying on the known until simplicity could be traded for a greater explanatory power. So, by staying with the limited assumption that the future near-peer adversary will be able to sense our activity at an earlier unseen level, we will, unless we change our default modus operandi, be exposed to increased threats and risks. The adversary’s acquired sensor data will be utilized for decision making, direction finding, and engaging friendly units with all the means that are available to the adversary.

The Army mindset must change to mirror the Navy’s tactic of “silent running” used to evade adversarial threats. While there are recent advances in sensor counter-measure techniques, such as low probability of detection and low probability of intercept, silent running reduces the emissions altogether, thus reducing the risk of detection.

In the U.S. Navy submarine fleet, silent running is a stealth mode utilized over the last 100 years following the introduction of passive sonar in the latter part of the First World War. The concept is to avoid discovery by the adversary’s passive sonar by seeking to eliminate all unnecessary noise. The ocean is an environment where hiding is difficult, similar to the Army’s future emission-dense battlefield.

However, on the battlefield, emissions can be managed in order to reduce noise feeding into the adversary’s sensors. A submarine in silent running mode will shut down non-mission essential systems. The crew moves silently and avoids creating any unnecessary sound, in combination with a reduction in speed to limit noise from shafts and propellers. The noise from the submarine no longer stands out. It is a sound among other natural and surrounding sounds which radically decreases the risk of detection.

From the Army’s perspective, the adversary’s primary objective when entering the fight is to disable command and control, elements of indirect fire, and enablers of joint warfighting. All of these units are highly active in the electromagnetic spectrum. So how can silent running be applied for a ground force?

If we transfer silent running to the Army, the same tactic can be as simple as not utilizing equipment just because it is fielded to the unit. If generators go offline when not needed, then sound, heat, and electromagnetic noise are reduced. Radios that are not mission-essential are switched to specific transmission windows or turned off completely, which limits the risk of signal discovery and potential geolocation. In addition, radios are used at the lowest power that still provides acceptable communication as opposed to using unnecessarily high power which would increase the range of detection. The bottom line: a paradigm shift is needed where we seek to emit a minimum number of detectable signatures, emissions, and radiation.

The submarine becomes undetectable as its noise level diminishes to the level of natural background noise which enables it to hide within the environment. Ground forces will still be detectable in some form – the future density of sensors and increased adversarial ability over time would support that – but one goal is to make the adversary’s situational picture blur and disable the ability to accurately assess the function, size, position, and activity of friendly units. The future fluid MDO (multi-domain operational) battlefield would also increase the challenge for the adversary compared to a more static battlefield with a clear separation between friend and foe.

As a preparation for a future near-peer fight, it is crucial to have an active mindset on avoiding unnecessary transmissions that could feed adversarial sensors with information that can guide their actions. This might require a paradigm shift, where we are migrating from an abundance of active systems to being minimalists in pursuit of stealth.

Jan Kallberg is a research scientist at the Army Cyber Institute at West Point and an assistant professor at the U.S. Military Academy. Col. Stephen Hamilton is the technical director of the Army Cyber Institute at West Point and an academy professor at the U.S. Military Academy. The views expressed are those of the authors and do not reflect the official policy or position of the Army Cyber Institute at West Point, the U.S. Military Academy, or the Department of Defense.

 

 

From the Adversary’s POV – Cyber Attacks to Delay CONUS Forces Movement to Port of Embarkation Pivotal to Success

We tend to see vulnerabilities and concerns about cyber threats to critical infrastructure from our own viewpoint. But an adversary will assess where and how a cyberattack on America will benefit the adversary’s strategy. I am not convinced attacks on critical infrastructure, in general, have the payoff that an adversary seeks.

The American reaction to Sept. 11 and any attack on U.S. soil gives a hint to an adversary that attacking critical infrastructure to create hardship for the population might work contrary to the intended softening of the will to resist foreign influence. It is more likely that attacks that affect the general population instead strengthen the will to resist and fight, similar to the British reaction to the German bombing campaign “Blitzen” in 1940. We can’t rule out attacks that affect the general population, but there are not enough offensive capabilities to attack all 16 sectors of critical infrastructure and gain a strategic momentum. An adversary has limited cyberattack capabilities and needs to prioritize cyber targets that are aligned with the overall strategy. Trying to see what options, opportunities, and directions an adversary might take requires we change our point of view to the adversary’s outlook. One of my primary concerns is pinpointed cyber-attacks disrupting and delaying the movement of U.S. forces to theater. 

Seen for the potential adversary’s point of view, bringing the cyber fight to our homeland – think delaying the transportation of U.S. forces to theater by attacking infrastructure and transportation networks from bases to the port of embarkation – is a low investment/high return operation. Why does it matter?

First, the bulk of the U.S. forces are not in the region where the conflict erupts. Instead, they are mainly based in the continental United States and must be transported to theater. From an adversary’s perspective, the delay of U.S. forces’ arrival might be the only opportunity. If the adversary can utilize an operational and tactical superiority in the initial phase of the conflict, by engaging our local allies and U.S. forces in the region swiftly, territorial gains can be made that are too costly to reverse later, leaving the adversary in a strong bargaining position.

Second, even if only partially successful, cyberattacks that delay U.S. forces’ arrival will create confusion. Such attacks would mean units might arrive at different ports, at different times and with only a fraction of the hardware or personnel while the rest is stuck in transit.

Third, an adversary that is convinced before a conflict that it can significantly delay the arrival of U.S. units from the continental U.S. to a theater will do a different assessment of the risks of a fait accompli attack. Training and Doctrine Command defines such an attack as one that “ is intended to achieve military and political objectives rapidly and then to quickly consolidate those gains so that any attempt to reverse the action by the U.S. would entail unacceptable cost and risk.” Even if an adversary is long-term strategically inferior, the window of opportunity due to assumed delay of moving units from the continental U.S. to theater might be enough for them to take military action seeking to establish a successful fait accompli-attack.

In designing a cyber defense for critical infrastructure, it is vital that what matters to the adversary is a part of the equation. In peacetime, cyberattacks probe systems across society, from waterworks, schools, social media, retail, all the way to sawmills. Cyberattacks in war time will have more explicit intent and seek a specific gain that supports the strategy. Therefore, it is essential to identify and prioritize the critical infrastructure that is pivotal at war, instead of attempting to spread out the defense to cover everything touched in peacetime.

Jan Kallberg, Ph.D., LL.M., is a research scientist at the Army Cyber Institute at West Point and an assistant professor in the department of social sciences at the United States Military Academy. The views expressed are those of the author and do not reflect the official policy or position of the Army Cyber Institute at West Point, the United States Military Academy, or the Department of Defense.

Time – and the lack thereof

For cybersecurity, it is pivotal for the next decade to be able to operate with a decreasing time window to act.

The accelerated execution of cyber attacks and an increased ability to at machine-speed identify vulnerabilities for exploitation compress the time window cybersecurity management has to address the unfolding events. In reality, we assume there will be time to lead, assess, analyze, but that window might be closing. It is time to raise the issue of accelerated cyber engagements.

Limited time to lead

If there is limited time to lead, how do you ensure that you can execute a defensive strategy? How do we launch counter-measures at speed beyond human ability and comprehension? If you don’t have time to lead, the alternative would be to preauthorize.

In the early days of the “Cold War” war planners and strategists who were used to having days to react to events faced ICBM that forced decisions within minutes. The solution? Preauthorization. The analogy between how the nuclear threat was addressed and cybersecurity works to a degree – but we have to recognize that the number of possible scenarios in cybersecurity could be on the hundreds and we need to prioritize.

The cybersecurity preauthorization process would require an understanding of likely scenarios and the unfolding events to follow these scenarios. The weaknesses in preauthorization are several. First, the limitations of the scenarios that we create because these scenarios are built on how we perceive our system environment. This is exemplified by the old saying: “What gets us into trouble is not what we don’t know. It’s what we know for sure that just ain’t so.”

The creation of scenarios as a foundation for preauthorization will be laden with biases, assumption that some areas are secure that isn’t, and the inability to see attack vectors that an attacker sees. So, the major challenge becomes when to consider preauthorization is to create scenarios that are representative of potential outfalls.

One way is to look at the different attack strategies used earlier. This limits the scenarios to what has already happened to others but could be a base where additional scenarios are added to. The MITRE Att&ck Navigator provides an excellent tool to simulate and create attack scenarios that can be a foundation for preauthorization. As we progress, and artificial intelligence becomes an integrated part of offloading decision making, but we are not there yet. In the near future, artificial intelligence can cover parts of the managerial spectrum, increasing the human ability to act in very brief time windows.

The second weakness is the preauthorization’s vulnerability against probes and reverse-engineering. Cybersecurity is active 24/7/365 with numerous engagements on an ongoing basis. Over time, and using machine learning, automated attack mechanisms could learn how to avoid triggering preauthorized responses by probing and reverse-engineer solutions that will trespass the preauthorized controls.

So there is no easy road forward, but instead, a tricky path that requires clear objectives, alignment with risk management and it’s risk appetite, and an acceptance that the final approach to address the increased velocity in the attacks might not be perfect. The alternative – to not address the accelerated execution of attacks is not a viable option. That would hand over the initiative to the attacker and expose the organization for uncontrolled risks.

Bye-bye, OODA-loop

Repeatedly through the last year, I have read references to the OODA-loop and the utility of the OODA-concept för cybersecurity. The OODA-loop resurface in cybersecurity and information security managerial approaches as a structured way to address unfolding events. The concept of the OODA (Observe, Orient, Decide, Act) loop developed by John Boyd in the 1960s follow the steps of observe, orient, decide, and act. You observe the events unfolding, you orient your assets at hand to address the events, you make up your mind of what is a feasible approach, and you act.

The OODA-loop has become been a central concept in cybersecurity the last decade as it is seen as a vehicle to address what attackers do, when, where, and what should you do and where is it most effective. The term has been “you need to get inside the attacker’s OODA-loop.” The OODA-loop is used as a way to understand the adversary and tailor your own defensive actions.

Retired Army Colonel Tom Cook, former research director for the Army Cyber Institute at West Point, and I wrote 2017 an IEEE article titled “The Unfitness of Traditional Military Thinking in Cyber” questioning the validity of using the OODA-loop in cyber when events are going to unfold faster and faster. Today, in 2019, the validity of the OODA-loop in cybersecurity is on the brink to evaporate due to increased speed in the attacks. The time needed to observe and assess, direct resources, make decisions, and take action will be too long to be able to muster a successful cyber defense.

Attacks occurring at computational speed worsens the inability to assess and act, and the increasingly shortened time frames likely to be found in future cyber conflicts will disallow any significant, timely human deliberation.

Moving forward

I have no intention of being a narrative impossibilist, who present challenges with no solutions, so the current way forward is preauthorizations. In the near future, the human ability to play an active role in rapid engagement will be supported by artificial intelligence decision-making that executes the tactical movements. The human mind is still in charge of the operational decisions for several reasons – control, larger picture, strategic implementation, and intent. For cybersecurity, it is pivotal for the next decade to be able to operate with a decreasing time window to act.

Jan Kallberg, PhD

At Machine Speed in Cyber – Leadership Actions Close to Nullified

In my view, one of the major weaknesses in cyber defense planning is the perception that there is time to lead a cyber defense while under attack. It is likely that a major attack is automated and premeditated. If it is automated the systems will execute the attacks at computational speed. In that case, no political or military leadership would be able to lead of one simple reason – it has already happened before they react.

A premeditated attack is planned for a long time, maybe years, and if automated, the execution of a massive number of exploits will be limited to minutes. Therefore, the future cyber defense would rely on components of artificial intelligence that can assess, act, and mitigate at computational speed. Naturally, this is a development that does not happen overnight.

In an environment where the actual digital interchange occurs at computational speed, the only thing the government can do is to prepare, give guidelines, set rules of engagement, disseminate knowledge to ensure a cyber-resilient society, and let the coders prepare the systems to survive in a degraded environment.

Another important factor is how these cyber defense measures can be reversed engineered and how visible they are in a pre-conflict probing wave of cyber attacks. If the preset cyber defense measures can be “measured up” early in a probing phase of a cyber conflict it is likely that the defense measures can through reverse engineering become a force multiplier for the future attacks – instead of bulwarks against the attacks.

So we enter the land of “damned if you do-damned if you don’t” because if we pre-stage the conflict with artificial intelligence supported decision systems that lead the cyber defense at the computational speed we are also vulnerable by being reverse engineered and the artificial intelligence becomes tangible stupidity.

We are in the early dawn of cyber conflicts, we can see the silhouettes of what is coming, but one thing becomes very clear – the time factor. Politicians and military leadership will have no factual impact on the actual events in real time in conflicts occurring at computational speed, so the focus has then to be at the front end. The leadership is likely to have the highest impact by addressing what has to be done pre-conflict to ensure resilience when under attack.

Jan Kallberg

Jan Kallberg is a research scientist at the Army Cyber Institute at West Point and an assistant professor in the department of social sciences at the United States Military Academy. The views expressed are those of the author and do not reflect the official policy or position of the Army Cyber Institute at West Point, the United States Military Academy or the Department of Defense.

The time to act is before the attack

 

In my view, one of the major weaknesses in cyber defense planning is the perception that there is time to lead a cyber defense while under attack. It is likely that a major attack is automated and premeditated. If it is automated the systems will execute the attacks at computational speed. In that case, no political or military leadership would be able to lead of one simple reason – it has already happened before they react.

A premeditated attack is planned for a long time, maybe years, and if automated, the execution of a massive number of exploits will be limited to minutes. Therefore, the future cyber defense would rely on components of artificial intelligence that can assess, act, and mitigate at computational speed. Naturally, this is a development that does not happen overnight.

In an environment where the actual digital interchange occurs at computational speed, the only thing the government can do is to prepare, give guidelines, set rules of engagement, disseminate knowledge to ensure a cyber resilient society, and let the coders prepare the systems to survive in a degraded environment.

Another important factor is how these cyber defense measures can be reversed engineered and how visible they are in a pre-conflict probing wave of cyber attacks. If the preset cyber defense measures can be “measured up” early in a probing phase of a cyber conflict it is likely that the defense measures can through reverse engineering become a force multiplier for the future attacks – instead of bulwarks against the attacks.

So we enter the land of “damned if you do-damned if you don’t” because if we pre-stage the conflict with artificial intelligence supported decision systems that lead the cyber defense at the computational speed we are also vulnerable by being reverse engineered and the artificial intelligence becomes tangible stupidity.

We are in the early dawn of cyber conflicts, we can see the silhouettes of what is coming, but one thing becomes very clear – the time factor. Politicians and military leadership will have no factual impact on the actual events in real time in conflicts occurring at computational speed, so focus have then to be at the front end. The leadership is likely to have the highest impact by addressing what has to be done pre-conflict to ensure resilience when under attack.

Jan Kallberg, PhD