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Israel’s brazen attacks on Hezbollah last week, in which hundreds of pagers and two-way radios exploded and killed at least 37 people, graphically illustrated a threat that cybersecurity experts have been warning about for years: Our international supply chains for computerized equipment leave us vulnerable. And we have no good means to defend ourselves.

Though the deadly operations were stunning, none of the elements used to carry them out were particularly new. The tactics employed by Israel, which has neither confirmed nor denied any role, to hijack an international supply chain and embed plastic explosives in Hezbollah devices have been used for years. What’s new is that Israel put them together in such a devastating and extravagantly public fashion, bringing into stark relief what the future of great power competition will look like—in peacetime, wartime and the ever expanding gray zone in between.

The targets won’t be just terrorists. Our computers are vulnerable, and increasingly so are our cars, our refrigerators, our home thermostats and many other useful things in our orbits. Targets are everywhere.

The core component of the operation, implanting plastic explosives in pagers and radios, has been a terrorist risk since Richard Reid, the so-called shoe bomber, tried to ignite some on an airplane in 2001. That’s what all of those airport scanners are designed to detect—both the ones you see at security checkpoints and the ones that later scan your luggage. Even a small amount can do an impressive degree of damage.

The second component, assassination by personal device, isn’t new, either. Israel used this tactic against a Hamas bomb maker in 1996 and a Fatah activist in 2000. Both were killed by remotely detonated booby-trapped cellphones.

The final and more logistically complex piece of Israel’s plan, attacking an international supply chain to compromise equipment at scale, is something that the United States has done, though for different purposes. The National Security Agency has intercepted communications equipment in transit and modified it not for destructive purposes but for eavesdropping. We know from an Edward Snowden document that the agency did this to a Cisco router destined for a Syrian telecommunications company. Presumably, this wasn’t the agency’s only operation of this type.

Creating a front company to fool victims isn’t even a new twist. Israel reportedly created a shell company to produce and sell explosive-laden devices to Hezbollah. In 2019 the FBI created a company that sold supposedly secure cellphones to criminals—not to assassinate them but to eavesdrop on and then arrest them.

The bottom line: Our supply chains are vulnerable, which means that we are vulnerable. Any individual, country or group that interacts with a high-tech supply chain can subvert the equipment passing through it. It can be subverted to eavesdrop. It can be subverted to degrade or fail on command. And although it’s harder, it can be subverted to kill.

Personal devices connected to the internet—and countries where they are in high use, such as the United States—are especially at risk. In 2007 the Idaho National Laboratory demonstrated that a cyberattack could cause a high-voltage generator to explode. In 2010 a computer virus believed to have been developed by the United States and Israel destroyed centrifuges at an Iranian nuclear facility. A 2017 dump of CIA documents included statements about the possibility of remotely hacking cars, which WikiLeaks asserted could be used to carry out “nearly undetectable assassinations.” This isn’t just theoretical: In 2015 a Wired reporter allowed hackers to remotely take over his car while he was driving it. They disabled the engine while he was on a highway.

The world has already begun to adjust to this threat. Many countries are increasingly wary of buying communications equipment from countries they don’t trust. The United States and others are banning large routers from the Chinese company Huawei because we fear that they could be used for eavesdropping and—even worse—disabled remotely in a time of escalating hostilities. In 2019 there was a minor panic over Chinese-made subway cars that could have been modified to eavesdrop on their riders.

It’s not just finished equipment that is under the scanner. More than a decade ago, the US military investigated the security risks of using Chinese parts in its equipment. In 2018 a Bloomberg report revealed US investigators had accused China of modifying computer chips to steal information.

It’s not obvious how to defend against these and similar attacks. Our high-tech supply chains are complex and international. It didn’t raise any red flags to Hezbollah that the group’s pagers came from a Hungary-based company that sourced them from Taiwan, because that sort of thing is perfectly normal. Most of the electronics Americans buy come from overseas, including our iPhones, whose parts come from dozens of countries before being pieced together primarily in China.

That’s a hard problem to fix. We can’t imagine Washington passing a law requiring iPhones to be made entirely in the United States. Labor costs are too high, and our country doesn’t have the domestic capacity to make these things. Our supply chains are deeply, inexorably international, and changing that would require bringing global economies back to the 1980s.

So what happens now? As for Hezbollah, its leaders and operatives will no longer be able to trust equipment connected to a network—very likely one of the primary goals of the attacks. And the world will have to wait to see if there are any long-term effects of this attack and how the group will respond.

But now that the line has been crossed, other countries will almost certainly start to consider this sort of tactic as within bounds. It could be deployed against a military during a war or against civilians in the run-up to a war. And developed countries like the United States will be especially vulnerable, simply because of the sheer number of vulnerable devices we have.

This essay originally appeared in The New York Times.

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I always like a good hack. And this story delivers. Basically, the New York City bikeshare program has a system to reward people who move bicycles from full stations to empty ones. By deliberately moving bikes to create artificial problems, and exploiting exactly how the system calculates rewards, some people are making a lot of money.

At 10 a.m. on a Tuesday last month, seven Bike Angels descended on the docking station at Broadway and 53rd Street, across from the Ed Sullivan Theater. Each rider used his own special blue key -­- a reward from Citi Bike—­ to unlock a bike. He rode it one block east, to Seventh Avenue. He docked, ran back to Broadway, unlocked another bike and made the trip again.

By 10:14, the crew had created an algorithmically perfect situation: One station 100 percent full, a short block from another station 100 percent empty. The timing was crucial, because every 15 minutes, Lyft’s algorithm resets, assigning new point values to every bike move.

The clock struck 10:15. The algorithm, mistaking this manufactured setup for a true emergency, offered the maximum incentive: $4.80 for every bike returned to the Ed Sullivan Theater. The men switched direction, running east and pedaling west.

Nicely done, people.

Now it’s Lyft’s turn to modify its system to prevent this hack. Thinking aloud, it could try to detect this sort of behavior in the Bike Angels data—and then ban people who are deliberately trying to game the system. The detection doesn’t have to be perfect, just good enough to catch bad actors most of the time. The detection needs to be tuned to minimize false positives, but that feels straightforward.