Entries Tagged "sensors"

Page 13 of 13

Detecting Nuclear Material in Transport

One of the few good things that’s coming out of the U.S. terrorism policy is some interesting scientific research. This paper discusses detecting nuclear material in transport.

The authors believe that fixed detectors—for example, at ports—simply won’t work. Terrorists are more likely to use highly enriched uranium (HEU), which is harder to detect, than plutonium. This difficulty of detection is more based on its natural rate of reactivity than on some technological hurdle. “The gamma rays and neutrons useful for detecting shielded HEU permit detection only at short distances (2-4 feet or less) and require that there be sufficient time to count a sufficient number of particles (several minutes to hours).”

The authors conclude that the only way to reliably detect shielded HEU is to build detectors into the transport vehicles. These detectors could take hours to record any radioactivity.

Posted on May 4, 2005 at 7:48 AMView Comments

Radiation Detectors in Ports

According to Reuters:

The United States is stepping up investment in radiation detection devices at its ports to thwart attempts to smuggle a nuclear device or dirty bomb into the country, a Senate committee heard on Wednesday.

Robert Bonner, commissioner of U.S. Customs and Border Protection, told a Senate subcommittee on homeland security that since the first such devices were installed in May 2000, they had picked up over 10,000 radiation hits in vehicles or cargo shipments entering the country. All proved harmless.

It amazes me that 10,000 false alarms—instances where the security system failed—are being touted as proof that the system is working.

As an example of how the system was working, Bonner said on Jan. 26, 2005, a machines got a hit from a South Korean vessel at the Los Angeles seaport. The radiation turned out to be emanating from the ship’s fire extinguishing system and was no threat to safety.

That sounds like an example of how the system is not working to me. Sometimes I wish that those in charge of security actually understood security.

Posted on March 16, 2005 at 7:51 AMView Comments

Foiling Metal Detectors

High school kids are sneaking cell phones past metal detectors.

From the New York Post:

Savvy students are figuring out all kinds of ways to get their cell phones past metal-detectors and school-security staff at city high schools, where the devices are banned.

Kids at Martin Luther King Jr. HS on the Upper West Side put the phones behind a belt buckle—and blame the buckle for the beeping metal-detector.

Some girls hide the phones where security guards won’t look—in their bras or between their legs.

Note that they’re not fooling the metal detectors; they’re fooling the people staffing the metal detectors.

Posted on October 27, 2004 at 1:44 PMView Comments

Technology and Counterterrorism

Technology makes us safer.

Communications technologies ensure that emergency response personnel can communicate with each other in an emergency—whether police, fire or medical. Bomb-sniffing machines now routinely scan airplane baggage. Other technologies may someday detect contaminants in our water supply or our atmosphere.

Throughout law enforcement and intelligence investigation, different technologies are being harnessed for the good of defense. However, technologies designed to secure specific targets have a limited value.

By its very nature, defense against terrorism means we must be prepared for anything. This makes it expensive—if not nearly impossible—to deploy threat-specific technological advances at all the places where they’re likely needed. So while it’s good to have bomb-detection devices in airports and bioweapon detectors in crowded subways, defensive technology cannot be applied at every conceivable target for every conceivable threat. If we spent billions of dollars securing airports and the terrorists shifted their attacks to shopping malls, we wouldn’t gain any security as a society.

It’s far more effective to try and mitigate the general threat. For example, technologies that improve intelligence gathering and analysis could help federal agents quickly chase down information about suspected terrorists. The technologies could help agents more rapidly uncover terrorist plots of any type and aimed at any target, from nuclear plants to the food supply. In addition, technologies that foster communication, coordination and emergency response could reduce the effects of a terrorist attack, regardless of what form the attack takes. We get the most value for our security dollar when we can leverage technology to extend the capabilities of humans.

Just as terrorists can use technology more or less wisely, we as defenders can do the same. It is only by keeping in mind the strengths and limitations of technology that we can increase our security without wasting money, freedoms or civil liberties, and without making ourselves more vulnerable to other threats. Security is a trade-off, and it is important that we use technologies that enable us to make better trade-offs and not worse ones.

Originally published on CNet

Posted on October 20, 2004 at 4:35 PMView Comments

License Plate "Guns" and Privacy

New Haven police have a new law enforcement tool: a license-plate scanner. Similar to a radar gun, it reads the license plates of moving or parked cars and links with remote police databases, immediately providing information about the car and owner. Right now the police check if there are any taxes owed on the car, if the car or license plate is stolen, and if the car is unregistered or uninsured. A car that comes up positive is towed.

On the face of it, this is nothing new. The police have always been able to run a license plate. The difference is they would do it manually, and that limited its use. It simply wasn’t feasible for the police to run the plates of every car in a parking garage, or every car that passed through an intersection. What’s different isn’t the police tactic, but the efficiency of the process.

Technology is fundamentally changing the nature of surveillance. Years ago, surveillance meant trench-coated detectives following people down streets. It was laborious and expensive, and was only used when there was reasonable suspicion of a crime. Modern surveillance is the policeman with a license-plate scanner, or even a remote license-plate scanner mounted on a traffic light and a policeman sitting at a computer in the station. It’s the same, but it’s completely different. It’s wholesale surveillance.

And it disrupts the balance between the powers of the police and the rights of the people.

Wholesale surveillance is fast becoming the norm. New York’s E-Z Pass tracks cars at tunnels and bridges with tolls. We can all be tracked by our cell phones. Our purchases are tracked by banks and credit card companies, our telephone calls by phone companies, our Internet surfing habits by Web site operators. Security cameras are everywhere. If they wanted, the police could take the database of vehicles outfitted with the OnStar tracking system, and immediately locate all of those New Haven cars.

Like the license-plate scanners, the electronic footprints we leave everywhere can be automatically correlated with databases. The data can be stored forever, allowing police to conduct surveillance backwards in time.

The effects of wholesale surveillance on privacy and civil liberties is profound; but unfortunately, the debate often gets mischaracterized as a question about how much privacy we need to give up in order to be secure. This is wrong. It’s obvious that we are all safer when the police can use all techniques at their disposal. What we need are corresponding mechanisms to prevent abuse, and that don’t place an unreasonable burden on the innocent.

Throughout our nation’s history, we have maintained a balance between the necessary interests of police and the civil rights of the people. The license plate itself is such a balance. Imagine the debate from the early 1900s: The police proposed affixing a plaque to every car with the car owner’s name, so they could better track cars used in crimes. Civil libertarians objected because that would reduce the privacy of every car owner. So a compromise was reached: a random string of letter and numbers that the police could use to determine the car owner. By deliberately designing a more cumbersome system, the needs of law enforcement and the public’s right to privacy were balanced.

The search warrant process, as prescribed in the Fourth Amendment, is another balancing method. So is the minimization requirement for telephone eavesdropping: the police must stop listening to a phone line if the suspect under investigation is not talking.

For license-plate scanners, one obvious protection is to require the police to erase data collected on innocent car owners immediately, and not save it. The police have no legitimate need to collect data on everyone’s driving habits. Another is to allow car owners access to the information about them used in these automated searches, and to allow them to challenge inaccuracies.

We need to go further. Criminal penalties are severe in order to create a deterrent, because it is hard to catch wrongdoers. As they become easier to catch, a realignment is necessary. When the police can automate the detection of a wrongdoing, perhaps there should no longer be any criminal penalty attached. For example, both red light cameras and speed-trap cameras all issue citations without any “points” assessed against the driver.

Wholesale surveillance is not simply a more efficient way for the police to do what they’ve always done. It’s a new police power, one made possible with today’s technology and one that will be made easier with tomorrow’s. And with any new police power, we as a society need to take an active role in establishing rules governing its use. To do otherwise is to cede ever more authority to the police.

This essay was originally published in the New Haven Register.

Posted on October 4, 2004 at 7:05 PMView Comments

License Plate "Guns" and Privacy

New Haven police have a new law enforcement tool: a license-plate scanner. Similar to a radar gun, it reads the license plates of moving or parked cars and links with remote police databases, immediately providing information about the car and owner. Right now the police check if there are any taxes owed on the car, if the car or license plate is stolen, and if the car is unregistered or uninsured. A car that comes up positive is towed.

On the face of it, this is nothing new. The police have always been able to run a license plate. The difference is they would do it manually, and that limited its use. It simply wasn’t feasible for the police to run the plates of every car in a parking garage, or every car that passed through an intersection. What’s different isn’t the police tactic, but the efficiency of the process.

Technology is fundamentally changing the nature of surveillance. Years ago, surveillance meant trench-coated detectives following people down streets. It was laborious and expensive, and was only used when there was reasonable suspicion of a crime. Modern surveillance is the policeman with a license-plate scanner, or even a remote license-plate scanner mounted on a traffic light and a policeman sitting at a computer in the station. It’s the same, but it’s completely different. It’s wholesale surveillance.

And it disrupts the balance between the powers of the police and the rights of the people.

Wholesale surveillance is fast becoming the norm. New York’s E-Z Pass tracks cars at tunnels and bridges with tolls. We can all be tracked by our cell phones. Our purchases are tracked by banks and credit card companies, our telephone calls by phone companies, our Internet surfing habits by Web site operators. Security cameras are everywhere. If they wanted, the police could take the database of vehicles outfitted with the OnStar tracking system, and immediately locate all of those New Haven cars.

Like the license-plate scanners, the electronic footprints we leave everywhere can be automatically correlated with databases. The data can be stored forever, allowing police to conduct surveillance backwards in time.

The effects of wholesale surveillance on privacy and civil liberties is profound; but unfortunately, the debate often gets mischaracterized as a question about how much privacy we need to give up in order to be secure. This is wrong. It’s obvious that we are all safer when the police can use all techniques at their disposal. What we need are corresponding mechanisms to prevent abuse, and that don’t place an unreasonable burden on the innocent.

Throughout our nation’s history, we have maintained a balance between the necessary interests of police and the civil rights of the people. The license plate itself is such a balance. Imagine the debate from the early 1900s: The police proposed affixing a plaque to every car with the car owner’s name, so they could better track cars used in crimes. Civil libertarians objected because that would reduce the privacy of every car owner. So a compromise was reached: a random string of letter and numbers that the police could use to determine the car owner. By deliberately designing a more cumbersome system, the needs of law enforcement and the public’s right to privacy were balanced.

The search warrant process, as prescribed in the Fourth Amendment, is another balancing method. So is the minimization requirement for telephone eavesdropping: the police must stop listening to a phone line if the suspect under investigation is not talking.

For license-plate scanners, one obvious protection is to require the police to erase data collected on innocent car owners immediately, and not save it. The police have no legitimate need to collect data on everyone’s driving habits. Another is to allow car owners access to the information about them used in these automated searches, and to allow them to challenge inaccuracies.

We need to go further. Criminal penalties are severe in order to create a deterrent, because it is hard to catch wrongdoers. As they become easier to catch, a realignment is necessary. When the police can automate the detection of a wrongdoing, perhaps there should no longer be any criminal penalty attached. For example, both red light cameras and speed-trap cameras all issue citations without any “points” assessed against the driver.

Wholesale surveillance is not simply a more efficient way for the police to do what they’ve always done. It’s a new police power, one made possible with today’s technology and one that will be made easier with tomorrow’s. And with any new police power, we as a society need to take an active role in establishing rules governing its use. To do otherwise is to cede ever more authority to the police.

This essay was originally published in the New Haven Register.

Posted on October 4, 2004 at 7:05 PMView Comments

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Sidebar photo of Bruce Schneier by Joe MacInnis.