The National Security Agency is secretly piggybacking on the tools that enable Internet advertisers to track consumers, using “cookies” and location data to pinpoint targets for government hacking and to bolster surveillance.
The agency’s internal presentation slides, provided by former NSA contractor Edward Snowden, show that when companies follow consumers on the Internet to better serve them advertising, the technique opens the door for similar tracking by the government. The slides also suggest that the agency is using these tracking techniques to help identify targets for offensive hacking operations.
For years, privacy advocates have raised concerns about the use of commercial tracking tools to identify and target consumers with advertisements. The online ad industry has said its practices are innocuous and benefit consumers by serving them ads that are more likely to be of interest to them.
The revelation that the NSA is piggybacking on these commercial technologies could shift that debate, handing privacy advocates a new argument for reining in commercial surveillance.
According to the documents, the NSA and its British counterpart, GCHQ, are using the small tracking files or “cookies” that advertising networks place on computers to identify people browsing the Internet. The intelligence agencies have found particular use for a part of a Google-specific tracking mechanism known as the “PREF” cookie. These cookies typically don’t contain personal information, such as someone’s name or e-mail address, but they do contain numeric codes that enable Web sites to uniquely identify a person’s browser.
In addition to tracking Web visits, this cookie allows NSA to single out an individual’s communications among the sea of Internet data in order to send out software that can hack that person’s computer. The slides say the cookies are used to “enable remote exploitation,” although the specific attacks used by the NSA against targets are not addressed in these documents.
The NSA’s use of cookies isn’t a technique for sifting through vast amounts of information to find suspicious behavior; rather, it lets NSA home in on someone already under suspicion – akin to when soldiers shine laser pointers on a target to identify it for laser-guided bombs.
Separately, the NSA is also using commercially gathered information to help it locate mobile devices around the world, the documents show. Many smartphone apps running on iPhones and Android devices, and the Apple and Google operating systems themselves, track the location of each device, often without a clear warning to the phone’s owner. This information is more specific than the broader location data the government is collecting from cellular phone networks, as reported by the Post last week.
“On a macro level, ‘we need to track everyone everywhere for advertising’ translates into ‘the government being able to track everyone everywhere,'” says Chris Hoofnagle, a lecturer in residence at UC Berkeley Law. “It’s hard to avoid.”
These specific slides do not indicate how the NSA obtains Google PREF cookies or whether the company cooperates in these programs, but other documents reviewed by the Post indicate that cookie information is among the data NSA can obtain with a Foreign Intelligence Surveillance Act order. If the NSA gets the data that way, the companies know and are legally compelled to assist.
The NSA declined to comment on the specific tactics outlined in this story, but an NSA spokesman sent the Post a statement: “As we’ve said before, NSA, within its lawful mission to collect foreign intelligence to protect the United States, uses intelligence tools to understand the intent of foreign adversaries and prevent them from bringing harm to innocent Americans.”
Google declined to comment for this article, but chief executive Larry Page joined the leaders of other technology companies earlier this week in calling for an end to bulk collection of user data and for new limits on court-approved surveillance requests. “The security of users’ data is critical, which is why we’ve invested so much in encryption and fight for transparency around government requests for information,” Page said in astatement on the coalition’s Web site. “This is undermined by the apparent wholesale collection of data, in secret and without independent oversight, by many governments around the world.”
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