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This language is broad, circular, and technically incoherent, so it takes some effort to parse appropriately. When the minimization procedures were disclosed in 2013, this language was interpreted by outside commentators to mean that NSA may keep all encrypted data that has been incidentally collected under Section 702 for at least as long as is necessary to decrypt that data. Is this the correct interpretation? I think so. It is important to realize that the language above isn’t just broad. It seems purposefully broad. The part regarding relevance seems to mirror the rationale NSA has used to justify its bulk phone records collection program. Under that program, all phone records were relevant because some of those records could be valuable to terrorism investigations and (allegedly) it isn’t possible to collect only those valuable records. This is the “to find a needle a haystack, you first have to have the haystack” argument. The same argument could be applied to encrypted data and might be at play here.

This exception doesn’t just apply to encrypted data that might be relevant to a current foreign intelligence investigation. It also applies to cases in which the encrypted data is likely to become relevant to a future intelligence requirement. This is some remarkably generous language. It seems one could justify keeping any type of encrypted data under this exception. Upon close reading, it is difficult to avoid the conclusion that these procedures were written carefully to allow NSA to collect and keep a broad category of encrypted data under the rationale that this data might contain the communications of NSA targets and that it might be decrypted in the future. If NSA isn’t doing this today, then whoever wrote these minimization procedures wanted to at least ensure that NSA has the authority to do this tomorrow.

There are a few additional observations that are worth making regarding these nominally new retention guidelines and Section 702 collection. First, the concept of incidental collection as it has typically been used makes very little sense when applied to encrypted data. The way that NSA’s Section 702 upstream “about” collection is understood to work is that technology installed on the network does some sort of pattern match on Internet traffic; say that an NSA target uses example@gmail.com to communicate. NSA would then search content of emails for references to example@gmail.com. This could notionally result in a lot of incidental collection of U.S. persons’ communications whenever the email that references example@gmail.com is somehow mixed together with emails that have nothing to do with the target. This type of incidental collection isn’t possible when the data is encrypted because it won’t be possible to search and find example@gmail.com in the body of an email. Instead, example@gmail.com will have been turned into some alternative, indecipherable string of bits on the network. Incidental collection shouldn’t occur because the pattern match can’t occur in the first place. This demonstrates that, when communications are encrypted, it will be much harder for NSA to search Internet traffic for a unique ID associated with a specific target.

This lends further credence to the conclusion above: rather than doing targeted collection against specific individuals, NSA is collecting, or plans to collect, a broad class of data that is encrypted. For example, NSA might collect all PGP encrypted emails or all Tor traffic. In those cases, NSA could search Internet traffic for patterns associated with specific types of communications, rather than specific individuals’ communications. This would technically meet the definition of incidental collection because such activity would result in the collection of communications of U.S. persons who aren’t the actual targets of surveillance. Collection of all Tor traffic would entail a lot of this “incidental” collection because the communications of NSA targets would be mixed with the communications of a large number of non-target U.S. persons. However, this “incidental” collection is inconsistent with how the term is typically used, which is to refer to over-collection resulting from targeted surveillance programs. If NSA were collecting all Tor traffic, that activity wouldn’t actually be targeted, and so any resulting over-collection wouldn’t actually be incidental. Moreover, greater use of encryption by the general public would result in an ever-growing amount of this type of incidental collection.

This type of collection would also be inconsistent with representations of Section 702 upstream collection that have been made to the public and to Congress. Intelligence officials have repeatedly suggested that search terms used as part of this program have a high degree of specificity. They have also argued that the program is an example of targeted rather than bulk collection. ODNI General Counsel Robert Litt, in a March 2014 meeting before the Privacy and Civil Liberties Oversight Board, stated that “there is either a misconception or a mischaracterization commonly repeated that Section 702 is a form of bulk collection. It is not bulk collection. It is targeted collection based on selectors such as telephone numbers or email addresses where there’s reason to believe that the selector is relevant to a foreign intelligence purpose.” The collection of Internet traffic based on patterns associated with types of communications would be bulk collection; more akin to NSA’s collection of phone records en mass than it is to targeted collection focused on specific individuals. Moreover, this type of collection would certainly fall within the definition of bulk collection provided just last week by the National Academy of Sciences: “collection in which a significant portion of the retained data pertains to identifiers that are not targets at the time of collection.”

The Section 702 minimization procedures, which will serve as a template for any new retention guidelines established for E.O. 12333 collection, create a large loophole for encrypted communications. With everything from email to Internet browsing to real-time communications moving to encrypted formats, an ever-growing amount of Internet traffic will fall within this loophole.

Senator Leahy, they don’t. The minimization procedures call for the deletion of innocent Americans’ information upon discovery to determine whether it has any foreign intelligence value. But what the board’s report found is that in fact information is never deleted. It sits in the databases for 5 years, or sometimes longer. And so the minimization doesn’t really address the privacy concerns of incidentally collected communications—again, where there’s been no warrant at all in the process… In the United States, we simply can’t read people’s emails and listen to their phone calls without court approval, and the same should be true when the government shifts its attention to Americans under this program. One of the most startling exchanges from the hearing today came toward the end of the session, when Senator Dianne Feinstein—who also sits on the Intelligence Committee—seemed taken aback by Ms. Goitein’s mention of “backdoor searches.” 

Feinstein: Wow, wow. What do you call it? What’s a backdoor search? Goitein: Backdoor search is when the FBI or any other agency targets a U.S. person for a search of data that was collected under Section 702, which is supposed to be targeted against foreigners overseas. Feinstein: Regardless of the minimization that was properly carried out. Goitein: Well the data is searched in its unminimized form. So the FBI gets raw data, the NSA, the CIA get raw data. And they search that raw data using U.S. person identifiers. That’s what I’m referring to as backdoor searches. It’s deeply concerning that any member of Congress, much less a member of the Senate Judiciary Committee and the Senate Intelligence Committee, might not be aware of the problem surrounding backdoor searches. In April 2014, the Director of National Intelligence acknowledged the searches of this data, which Senators Ron Wyden and Mark Udall termed “the ‘back-door search’ loophole in section 702.” The public was so incensed that the House of Representatives passed an amendment to that year's defense appropriations bill effectively banning the warrantless backdoor searches. Nonetheless, in the hearing today it seemed like Senator Feinstein might not recognize or appreciate the serious implications of allowing U.S. law enforcement agencies to query the raw data collected through these Internet surveillance programs. Hopefully today’s testimony helped convince the Senator that there is more to this topic than what she’s hearing in jargon-filled classified security briefings.