Metadata is more revealing

The American Civil Liberties Union sued the Obama administration on Tuesday over the National Security Agency’s secret program to vacuum up the phone records of millions of Americans. The lawsuit comes less than one week after The Guardian and The Washington Post revealed the existence of a secret court ruling ordering Verizon to hand over records of its business customers.

Susan Landau talking:

the metadata of a phone call tells what you do as opposed to what you say. So, for example, if you call from the hospital when you’re getting a mammogram, and then later in the day your doctor calls you, and then you call the surgeon, and then when you’re at the surgeon’s office you call your family, it’s pretty clear, just looking at that pattern of calls, that there’s been some bad news. If there’s a tight vote in Congress, and somebody who’s wavering on the edge, you discover that they’re talking to the opposition, you know which way they’re vote is going.

One of my favorite examples is, when Sun Microsystems was bought by Oracle, there were a number of calls that weekend before. One can imagine just the trail of calls. First the CEO of Sun and the CEO of Oracle talk to each other. Then probably they both talk to their chief counsels. Then maybe they talk to each other again, then to other people in charge. And the calls go back and forth very quickly, very tightly. You know what’s going to happen. You know what the announcement is going to be on Monday morning, even though you haven’t heard the content of the calls. So that metadata is remarkably revealing.

John Negroponte, the nation’s first director of national intelligence under President George W. Bush, has defended the surveillance program and the collection of metadata. He described metadata as, “like knowing what’s on the outside of an envelope.”

That’s not really true. That was the case when we had black telephones that weighed several pounds and sat on the living room table or the hall table, and you knew that there was a phone call from one house to another house. Now everybody carries cellphones with them. And so, the data is, when I call you, I know that I’m talking to you, but I have no idea where you are. It’s the phone company who has that data now. And that data is far more revealing than what’s on the outside of an envelope. As I said earlier, it’s what you do, not what you say. And because we’re carrying the cellphones with us and making calls all during the day, that it’s very, very revelatory.

In fact, all it takes is four data points to be 95 percent sure who the person is. I noticed President Obama said no names, but in fact, if you know four locations, because home and work are often unique pairs for most people, 95 percent location of—of times when you have four location points, you know who it is you’re listening to. So, you follow somebody, and they make calls from work every day, and then one day you notice they’ve made some calls from a bar at the end of the day. And then you discover somebody in middle age, somebody who ought to be working, is now making calls only from home. You know they’ve been fired, even though you haven’t listened to any of the content of the calls.

James Clapper said that we’re not getting—that the NSA was not getting data on millions of Americans. But given that Verizon and the other telecos presumably were also sending this information, and they were sending it daily, that does not appear to be true.

Now, what we don’t know, we don’t know a lot of things. One of the things we don’t know is the kind minimization that the NSA did on the data. When you do a criminal wiretap, you’re required to do what’s called minimization. You can listen to the call, but if it’s not the target of the investigation, if it’s not the criminal him or herself, but let’s say their teenage daughter, then you have to shut down the wiretap, and you can pick it up again in a couple of minutes. If it’s the criminal, but they’re talking about going out to buy milk, let’s say, unless you think that’s code for going out to pick up some heroin, you have to shut it down. That’s minimization.

We don’t know several things. First of all, of course, there was a secret interpretation of a law, and that has no place in a democracy. That’s tantamount to secret laws. But we also don’t know what kind of data minimization the NSA was doing, and that’s something that ought to come out in public hearings. That’s very different from exposing sources and methods.

So what Senator Wyden is talking about is that collection of metadata, and what he’s alluding to is how extremely powerful it is. Currently, our laws, our wiretapping laws, which were passed when phones didn’t move, back in the 1960s and ’70s, those wiretap laws protect content, very strongly. You need a wiretap warrant to get at content. But they protect the metadata—the who, the when, the what time, how long a call was for, the location—much less strongly. That needs to be changed. And, in fact, a bill was reported out of the Senate Judiciary Committee, the Electronic Communications Privacy Act—an updated version of the bill was reported out earlier this year. That’s what Senator Wyden is alluding to. The fact that that metadata, now that we carry cellphones, now that payphones essentially don’t exist—there are far fewer payphones than a decade ago, and so one has to rely on cellphones—Senator Wyden is saying that information is very private information. It reveals a remarkable amount about what a person is doing, who they are, whom they associate with, who they spend their nights with, where they are when they travel. All that kind of information is very private, deserves constitutional protection. And yet, under a secret interpretation of the law, it’s in fact being handed over to the government. And that’s what Senator Wyden is saying.

what Edward Snowden’s done is opened up a public debate about something that should have been public many, many years ago. We can’t have secret interpretations of law in a democracy.

Where do I think things should go? I think there need to be two investigations. One, I think Senator Feinstein is absolutely right, although I would target things a little bit differently. We’ve developed a surveillance-industrial complex, as has been exhibited to the public now, and I think that’s where Senator Feinstein should concentrate. I think it’s time for a Church-type Committee investigation, under perhaps the aegis of the Judiciary Committee, under perhaps Senator Leahy, but we need an examination of the surveillance laws and what we’re doing, why we’re doing it, what was done illegally, and so on. And it needs to be a broad investigation, the same way it was done in the 1970s under the Church Committee.

– source democracynow.org

Susan Landau, a mathematician and former Sun Microsystems engineer, she is the author of the book Surveillance or Security?: The Risks Posed by New Wiretapping Technologies.