Ordinary Internet users, American and non-American alike, far outnumber legally targeted foreigners in the communications intercepted by the National Security Agency from U.S. digital networks, according to a four-month investigation by The Washington Post.
Nine of 10 account holders found in a large cache of intercepted conversations, which former NSA contractor Edward Snowden provided in full to The Post, were not the intended surveillance targets but were caught in a net the agency had cast for somebody else.
Many of them were Americans. Nearly half of the surveillance files, a strikingly high proportion, contained names, e-mail addresses or other details that the NSA marked as belonging to U.S. citizens or residents. NSA analysts masked, or “minimized,” more than 65,000 such references to protect Americans’ privacy, but The Post found nearly 900 additional e-mail addresses, unmasked in the files, that could be strongly linked to U.S. citizens or U.S.residents.
The surveillance files highlight a policy dilemma that has been aired only abstractly in public. There are discoveries of considerable intelligence value in the intercepted messages — and collateral harm to privacy on a scale that the Obama administration has not been willing to address.
Among the most valuable contents — which The Post will not describe in detail, to avoid interfering with ongoing operations — are fresh revelations about a secret overseas nuclear project, double-dealing by an ostensible ally, a military calamity that befell an unfriendly power, and the identities of aggressive intruders into U.S. computer networks.
Months of tracking communications across more than 50 alias accounts, the files show, led directly to the 2011 capture in Abbottabad of Muhammad Tahir Shahzad, a Pakistan-based bomb builder, and Umar Patek, a suspect in a 2002 terrorist bombing on the Indonesian island of Bali. At the request of CIA officials, The Post is withholding other examples that officials said would compromise ongoing operations.
Many other files, described as useless by the analysts but nonetheless retained, have a startlingly intimate, even voyeuristic quality. They tell stories of love and heartbreak, illicit sexual liaisons, mental-health crises, political and religious conversions, financial anxieties and disappointed hopes. The daily lives of more than 10,000 account holders who were not targeted are catalogued and recorded nevertheless.....
When NSA and allied analysts really want to target an account, their concern for U.S. privacy diminishes. The rationales they use to judge foreignness sometimes stretch legal rules or well-known technical facts to the breaking point.
In their classified internal communications, colleagues and supervisors often remind the analysts that PRISM and Upstream collection have a “lower threshold for foreignness ‘standard of proof’ ” than a traditional surveillance warrant from a FISA judge, requiring only a “reasonable belief” and not probable cause.
One analyst rests her claim that a target is foreign on the fact that his e-mails are written in a foreign language, a quality shared by tens of millions of Americans. Others are allowed to presume that anyone on the chat “buddy list” of a known foreign national is also foreign.
In many other cases, analysts seek and obtain approval to treat an account as “foreign” if someone connects to it from a computer address that seems to be overseas. “The best foreignness explanations have the selector being accessed via a foreign IP address,” an NSA supervisor instructs an allied analyst in Australia.
Apart from the fact that tens of millions of Americans live and travel overseas, additional millions use simple tools called proxies to redirect their data traffic around the world, for business or pleasure. World Cup fans this month have been using a browser extension called Hola to watch live-streamed games that are unavailable from their own countries. The same trick is routinely used by Americans who want to watch BBC video. The NSA also relies routinely on locations embedded in Yahoo tracking cookies, which are widely regarded by online advertisers as unreliable.
In an ordinary FISA surveillance application, the judge grants a warrant and requires a fresh review of probable cause — and the content of collected surveillance — every 90 days. When renewal fails, NSA and allied analysts sometimes switch to the more lenient standards of PRISM and Upstream.
“These selectors were previously under FISA warrant but the warrants have expired,” one analyst writes, requesting that surveillance resume under the looser standards of Section 702. The request was granted....
