WASHINGTON — American officials are endangered that a Chinese supervision could use a stolen annals of millions of sovereign workers and contractors to square together a identities of comprehension officers personally posted in China over a years.
The intensity bearing of a comprehension officers could forestall a immeasurable cadre of American spies from ever being posted abroad again, stream and former comprehension officials said. It would be a poignant reversal for comprehension agencies already endangered that a new information crack during a Office of Personnel Management is a vital asset for Chinese espionage efforts.
In a days after a crack of annals of millions of sovereign workers and contractors became open final month, some officials in a Obama administration pronounced that a burglary was not as deleterious as it competence have been since a Chinese hackers did not benefit entrance to a identities of American clandestine spies.
The annals of a C.I.A. and some other comprehension agencies, they said, were never partial of a crew office’s databases, and were stable during a breach. Officials pronounced comprehension agencies were holding stairs to try to lessen a damage, nonetheless it is misleading what they are privately doing.
But comprehension and congressional officials now contend there is good regard that a hackers — who supervision officials are now demure to contend publicly were operative for a Chinese supervision — could still use a immeasurable trove of information to brand American spies by a routine of elimination. By mixing a stolen information with information they have collected over time, they said, a hackers can use “big information analytics” to pull conclusions about a identities of operatives.
“The information that was exfiltrated was profitable in a possess right,” pronounced Representative Adam B. Schiff of California, a tip Democrat on a House Intelligence Committee. “It’s even some-more compromising when it is used in multiple with other information they competence hold. It competence take years before we’re wakeful of a full border of a damage.”
The C.I.A. and other agencies with clandestine officers would be discreet about immediately withdrawing spies from China since that would lift suspicions among Chinese counterintelligence operatives. A C.I.A. orator declined to comment.
The C.I.A. and other agencies typically post their spies in American embassies, where a officers poise as diplomats operative on domestic affairs, rural routine or other issues. The American Embassy in Beijing has prolonged housed one of a largest C.I.A. stations in a world, with comprehension officers entertainment information on China’s domestic maneuvering, mercantile growth and troops modernization.
Several stream and former officials pronounced that even if a identities of a group officers were not in a crew office’s database, Chinese comprehension operatives could run searches by a database on everybody postulated visas to work during American tactful outposts in China. If any of a names are not found in a stolen files, those people could be suspected as spies by a routine of elimination.
The executive of a National Security Agency, Adm. Michael S. Rogers, alluded to that problem Thursday night during an talk during a Aspen Security Forum in Colorado.
“From an comprehension perspective, it gives we good discernment potentially used for counterintelligence purposes,” Admiral Rogers said. “If I’m meddlesome in perplexing to brand U.S. persons who competence be in my nation — and we am perplexing to figure out since they are there: Are they only tourists? Are they there for some other choice purpose? — there are engaging insights from a information we take from O.P.M.”
Admiral Rogers suggested another probable ground of a hackers: The information could be used for building worldly “spear phishing” attacks on supervision officials. In those attacks, victims click on what seem to be trusting emails from famous sources, permitting viruses into their mechanism networks.
Admiral Rogers pronounced it was “not maybe separate that in a past 9 months we am examination outrageous stalk phishing campaigns targeted during a United States,” nonetheless he would not name a countries that are a sources of a attacks.
Officials pronounced it was not nonetheless transparent how Chinese officials were regulating — or competence use — a stolen files, that embody personal information collected during credentials checks of supervision workers, many who now reason Top Secret clearances.
“As a unsentimental matter, we have to assume that all of a information has been unprotected and can be exploited,” pronounced Mr. Schiff, who combined that it was advantageous to devise for “worst-case scenarios.”
Some former officials pronounced they were not overly dumbfounded that a information crack could do long-term repairs to American comprehension collection, observant it was capricious how many tough conclusions about American spies a Chinese could pull from a millions of crew files — a towering of information that could turn overwhelming.
“The Chinese have combined their possess large information problem,” pronounced Rob Knake, a former executive of cybersecurity routine issues during a National Security Council and now a comparison associate during a Council on Foreign Relations.
Mr. Knake pronounced a C.I.A. and other comprehension agencies would be means to adjust in a eventuality that secrets were exposed. Still, he said, a crack had a intensity for “a whole garland of C.I.A. box officers spending a rest of their careers roving desks.”
Sophisticated computers versed to investigate millions and even billions of files concede comprehension operatives to make use of information that was once of capricious value.
Joel Brenner, a former conduct of counterintelligence for a executive of inhabitant intelligence, pronounced a Chinese could hunt a database with a names of suspected spies they had collected over a years. “You run 200 of those people through, and we have a flattering good thought of what they are and are not gripping in a system,” he said.
In a United States supervision there is small discuss that China was a source of a conflict on a Office of Personnel Management, that unfolded over during slightest 18 months. Last month a executive of inhabitant intelligence, James R. Clapper Jr., said, “You’ve got to salute a Chinese for what they did,” before retreating to contend China was a “leading suspect” in a case.
One former comparison C.I.A. officer and one congressional official, both vocalization on a condition of anonymity since they have perceived personal briefings about a information breach, pronounced a hackers also managed to get personal information of late C.I.A. officers that was in a databases.
Current and former American officials pronounced that a hacking of a confidence clearway information will be a problem for years. The rarely personal and potentially annoying information in a credentials questionnaires includes sum about finances, drug and ethanol use, contacts with foreigners and mental health issues.
Mr. Clapper pronounced Friday in Aspen that O.P.M.’s contractors had depressed so distant behind in conducting confidence clearances — partly since of a hacking — that a comprehension agency’s periodic examination of employees was distant behind. But he was philosophical about a breach.
“If we had a event to do a same thing,” he said, “we’d substantially do it.”
Correction: Jul 24, 2015
An progressing chronicle of this essay misstated a center initial of a executive of inhabitant comprehension and wanting his suffix. He is James R. Clapper Jr., not James A. Clapper.