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Today we’re announcing the launch of STARTTLS Everywhere, EFF’s initiative to improve the security of the email ecosystem. Thanks to previous EFF efforts like Let's Encrypt, and Certbot, as well as help from the major web browsers, we've seen significant wins in encrypting the web. Now we want to do for email what we’ve done for web browsing: make it simple and easy for everyone to help ensure their communications aren’t vulnerable to mass surveillance.

t’s important to note that STARTTLS Everywhere is designed to be run by mailserver admins, not regular users. No matter your role, you can join in the STARTTLS fun and find out how secure your current email provider is at: https://www.starttls-everywhere.org/ Enter your email domain (the part of your email address after the “@” symbol), and we’ll check if your email provider has configured their server to use STARTTLS, whether or not they use a valid certificate, and whether or not they’re on the STARTTLS Preload List—all different indications of how secure (or vulnerable) your email provider is to mass surveillance.

1. Executive Summary Ahmed Mansoor is an internationally recognized human rights defender, based in the United Arab Emirates (UAE), and recipient of the Martin Ennals Award (sometimes referred to as a “Nobel Prize for human rights”).  On August 10 and 11, 2016, Mansoor received SMS text messages on his iPhone promising “new secrets” about detainees tortured in UAE jails if he clicked on an included link. Instead of clicking, Mansoor sent the messages to Citizen Lab researchers.  We recognized the links as belonging to an exploit infrastructure connected to NSO Group, an Israel-based “cyber war” company that sells Pegasus, a government-exclusive “lawful intercept” spyware product.  NSO Group is reportedly owned by an American venture capital firm, Francisco Partners Management. The ensuing investigation, a collaboration between researchers from Citizen Lab and from Lookout Security, determined that the links led to a chain of zero-day exploits (“zero-days”) that would have remotely jailbroken Mansoor’s stock iPhone 6 and installed sophisticated spyware.  We are calling this exploit chain Trident.  Once infected, Mansoor’s phone would have become a digital spy in his pocket, capable of employing his iPhone’s camera and microphone to snoop on activity in the vicinity of the device, recording his WhatsApp and Viber calls, logging messages sent in mobile chat apps, and tracking his movements.   We are not aware of any previous instance of an iPhone remote jailbreak used in the wild as part of a targeted attack campaign, making this a rare find.

The Trident Exploit Chain: CVE-2016-4657: Visiting a maliciously crafted website may lead to arbitrary code execution CVE-2016-4655: An application may be able to disclose kernel memory CVE-2016-4656: An application may be able to execute arbitrary code with kernel privileges Once we confirmed the presence of what appeared to be iOS zero-days, Citizen Lab and Lookout quickly initiated a responsible disclosure process by notifying Apple and sharing our findings. Apple responded promptly, and notified us that they would be addressing the vulnerabilities. We are releasing this report to coincide with the availability of the iOS 9.3.5 patch, which blocks the Trident exploit chain by closing the vulnerabilities that NSO Group appears to have exploited and sold to remotely compromise iPhones. Recent Citizen Lab research has shown that many state-sponsored spyware campaigns against civil society groups and human rights defenders use “just enough” technical sophistication, coupled with carefully planned deception. This case demonstrates that not all threats follow this pattern.  The iPhone has a well-deserved reputation for security.  As the iPhone platform is tightly controlled by Apple, technically sophisticated exploits are often required to enable the remote installation and operation of iPhone monitoring tools. These exploits are rare and expensive. Firms that specialize in acquiring zero-days often pay handsomely for iPhone exploits.  One such firm, Zerodium, acquired an exploit chain similar to the Trident for one million dollars in November 2015. The high cost of iPhone zero-days, the apparent use of NSO Group’s government-exclusive Pegasus product, and prior known targeting of Mansoor by the UAE government provide indicators that point to the UAE government as the likely operator behind the targeting. Remarkably, this case marks the third commercial “lawful intercept” spyware suite employed in attempts to compromise Mansoor.  In 2011, he was targeted with FinFisher’s FinSpy spyware, and in 2012 he was targeted with Hacking Team’s Remote Control System.  Both Hacking Team and FinFisher have been the object of several years of revelations highlighting the misuse of spyware to compromise civil society groups, journalists, and human rights workers.

NSO Group, an Israeli vendor of “lawful” hacking tools designed to infect a target’s phone with spyware, is regarded by many as a bad actor. The group claims to be shocked when its products are misused, as they have been in Mexico, Saudi Arabia and the United Arab Emirates. One incident might be excusable, but the group’s continued enabling of misbehavior has resulted in well-earned enmity. Recently, Facebook struck back. NSO Group deployed a weaponized exploit for Facebook’s WhatsApp messenger, integrated it into its Pegasus malcode system, and offered it to its customers (a mix of legitimate government agencies and nefarious government actors) interested in hacking WhatsApp users beginning in April. This was a particularly powerful exploit because it required no user interaction and the only sign of the exploit a user might discover would be a series of “missed calls” received on the user’s phone. Facebook patched the vulnerability on May 13, blocking the NSO campaign. Facebook wasn’t satisfied with simply closing the vulnerability. In cooperation with CitizenLab, Facebook identified more than 100 incidents in which NSO Group’s WhatsApp exploit appeared to target human rights activists and journalists. In total, Facebook and CitizenLab identified 1,400 targets (which apparently also included government officials in U.S. allied governments). They then filed a federal lawsuit against NSO Group, closed NSO Group member accounts, and, most damaging of all to NSO’s customers, sent a notice to all identified victims alerting them of the attack. This meant that all targets, both dissidents and drug lords alike, were notified of this surveillance. The lawsuit will be a case to watch. Facebook has already revealed a large amount of detail concerning NSO Group’s internal workings, including the hands-on nature of its business model: NSO Group actively assists countries in hacking targets. For example, we now know that while an NSO Group employee may not press the “Enter” key for a target, NSO employees do act to advise and consult on targeting; and NSO Group is largely responsible for running the infrastructure used to exploit targets and manage implants. Expect more revelations like this as the case proceeds.

The American Civil Liberties Union (ACLU) has filed a motion to reveal the secret court opinions with “novel or significant interpretations” of surveillance law, in a renewed push for government transparency. The motion, filed Wednesday by the ACLU and Yale Law School’s Media Freedom and Information Access Clinic, asks the Foreign Intelligence Surveillance Act (FISA) Court, which rules on intelligence gathering activities in secret, to release 23 classified decisions it made between 9/11 and the passage of the USA Freedom Act in June 2015. As ACLU National Security Project staff attorney Patrick Toomey explains, the opinions are part of a “much larger collection of hidden rulings on all sorts of government surveillance activities that affect the privacy rights of Americans.” Among them is the court order that the government used to direct Yahoo to secretly scanits users’ emails for “a specific set of characters.” Toomey writes: These court rulings are essential for the public to understand how federal laws are being construed and implemented. They also show how constitutional protections for personal privacy and expressive activities are being enforced by the courts. In other words, access to these opinions is necessary for the public to properly oversee their government.

Although the USA Freedom Act requires the release of novel FISA court opinions on surveillance law, the government maintains that the rule does not apply retroactively—thereby protecting the panel from publishing many of its post-9/11 opinions, which helped create an “unprecedented buildup” of secret surveillance laws. Even after National Security Agency (NSA) whistleblower Edward Snowden revealed the scope of mass surveillance in 2013, sparking widespread outcry, dozens of rulings on spying operations remain hidden from the public eye, which stymies efforts to keep the government accountable, civil liberties advocates say. “These rulings are necessary to inform the public about the scope of the government’s surveillance powers today,” the ACLU’s motion states.

Toomey writes that the rulings helped influence a number of novel spying activities, including: The government’s use of malware, which it calls “Network Investigative Techniques” The government’s efforts to compel technology companies to weaken or circumvent their own encryption protocols The government’s efforts to compel technology companies to disclose their source code so that it can identify vulnerabilities The government’s use of “cybersignatures” to search through internet communications for evidence of computer intrusions The government’s use of stingray cell-phone tracking devices under the Foreign Intelligence Surveillance Act (FISA) The government’s warrantless surveillance of Americans under FISA Section 702—a controversial authority scheduled to expire in December 2017 The bulk collection of financial records by the CIA and FBI under Section 215 of the Patriot Act Without these rulings being made public, “it simply isn’t possible to understand the government’s claimed authority to conduct surveillance,” Toomey writes. As he told The Intercept on Wednesday, “The people of this country can’t hold the government accountable for its surveillance activities unless they know what our laws allow. These secret court opinions define the limits of the government’s spying powers. Their disclosure is essential for meaningful public oversight in our democracy.”

Last month, we wrote about Bruce Schneier's warning that certain unknown parties were carefully testing ways to take down the internet. They were doing carefully configured DDoS attacks, testing core internet infrastructure, focusing on key DNS servers. And, of course, we've also been talking about the rise of truly massive DDoS attacks, thanks to poorly secured Internet of Things (IoT) devices, and ancient, unpatched bugs. That all came to a head this morning when large chunks of the internet went down for about two hours, thanks to a massive DDoS attack targeting managed DNS provider Dyn. Most of the down sites are back (I'm still having trouble reaching Twitter), but it was pretty widespread, and lots of big name sites all went down. Just check out this screenshot from Downdetector showing the outages on a bunch of sites:

You'll see not all of them have downtime (and the big ISPs, as always, show lots of complaints about downtimes), but a ton of those sites show a giant spike in downtime for a few hours. So, once again, we'd like to point out that this is as problem that the internet community needs to start solving now. There's been a theoretical threat for a while, but it's no longer so theoretical. Yes, some people point out that this is a difficult thing to deal with. If you're pointing people to websites, even if we were to move to a more distributed system, there are almost always some kinds of chokepoints, and those with malicious intent will always, eventually, target those chokepoints. But there has to be a better way -- because if there isn't, this kind of thing is going to become a lot worse.

Disaster stories involving the Internet of Things are all the rage. They feature cars (both driven and driverless), the power grid, dams, and tunnel ventilation systems. A particularly vivid and realistic one, near-future fiction published last month in New York Magazine, described a cyberattack on New York that involved hacking of cars, the water system, hospitals, elevators, and the power grid. In these stories, thousands of people die. Chaos ensues. While some of these scenarios overhype the mass destruction, the individual risks are all real. And traditional computer and network security isn’t prepared to deal with them.Classic information security is a triad: confidentiality, integrity, and availability. You’ll see it called “CIA,” which admittedly is confusing in the context of national security. But basically, the three things I can do with your data are steal it (confidentiality), modify it (integrity), or prevent you from getting it (availability).

So far, internet threats have largely been about confidentiality. These can be expensive; one survey estimated that data breaches cost an average of $3.8 million each. They can be embarrassing, as in the theft of celebrity photos from Apple’s iCloud in 2014 or the Ashley Madison breach in 2015. They can be damaging, as when the government of North Korea stole tens of thousands of internal documents from Sony or when hackers stole data about 83 million customer accounts from JPMorgan Chase, both in 2014. They can even affect national security, as in the case of the Office of Personnel Management data breach by—presumptively—China in 2015. On the Internet of Things, integrity and availability threats are much worse than confidentiality threats. It’s one thing if your smart door lock can be eavesdropped upon to know who is home. It’s another thing entirely if it can be hacked to allow a burglar to open the door—or prevent you from opening your door. A hacker who can deny you control of your car, or take over control, is much more dangerous than one who can eavesdrop on your conversations or track your car’s location. With the advent of the Internet of Things and cyber-physical systems in general, we've given the internet hands and feet: the ability to directly affect the physical world. What used to be attacks against data and information have become attacks against flesh, steel, and concrete. Today’s threats include hackers crashing airplanes by hacking into computer networks, and remotely disabling cars, either when they’re turned off and parked or while they’re speeding down the highway. We’re worried about manipulated counts from electronic voting machines, frozen water pipes through hacked thermostats, and remote murder through hacked medical devices. The possibilities are pretty literally endless. The Internet of Things will allow for attacks we can’t even imagine.

To penetrate the computers of foreign targets, the National Security Agency relies on software flaws that have gone undetected in the pipes of the Internet. For years, security experts have pressed the agency to disclose these bugs so they can be fixed, but the agency hackers have often been reluctant. Now with the mysterious release of a cache of NSA hacking tools over the weekend, the agency has lost an offensive advantage, experts say, and potentially placed at risk the security of countless large companies and government agencies worldwide. Several of the tools exploited flaws in commercial firewalls that remain unpatched, and they are out on the Internet for all to see. Anyone from a basement hacker to a sophisticated foreign spy agency has access to them now, and until the flaws are fixed, many computer systems may be in jeopardy. The revelation of the NSA cache, which dates to 2013 and has not been confirmed by the agency, also highlights the administration’s little-known process for figuring out which software errors to disclose and which to keep secret.

The FBI may be allowed to withhold information about how it broke into an iPhone belonging to a gunman in the December San Bernardino shootings, despite a U.S. government policy of disclosing technology security flaws discovered by federal agencies. Under the U.S. vulnerabilities equities process, the government is supposed to err in favor of disclosing security issues so companies can devise fixes to protect data. The policy has exceptions for law enforcement, and there are no hard rules about when and how it must be applied.Apple Inc has said it would like the government to share how it cracked the iPhone security protections. But the Federal Bureau of Investigation, which has been frustrated by its inability to access data on encrypted phones belonging to criminal suspects, might prefer to keep secret the technique it used to gain access to gunman Syed Farook's phone. The referee is likely to be a White House group formed during the Obama administration to review computer security flaws discovered by federal agencies and decide whether they should be disclosed.

Stewart Baker, former general counsel of the NSA and now a lawyer with Steptoe & Johnson, said the review process could be complicated if the cracking method is considered proprietary by the third party that assisted the FBI.Several security researchers have pointed to the Israel-based mobile forensics firm Cellebrite as the likely third party that helped the FBI. That company has repeatedly declined comment.

Internet and computer security company Symantec has issued a statement today related to the Vault 7 WikiLeaks documents leaked from the CIA, saying that the methods and protocols described in the documents are consistent with cyberattacks they’d been tracking for years. Symantec says they now believe that the CIA hacking tool Fluxwire is a malware that had been known as Corentry, which Symantec had previously attributed to an unknown cyberespionage group called Longhorn, which apparently was the CIA. They described Longhorn as having been active since at least 2011, and responsible for attacks in at least 16 countries across the world, targeting governments and NGOs, as well as financial, energy, and natural resource companies, things that would generally be of interest to a nation-state.

While the WikiLeaks themselves have been comparatively short on details, as WikiLeaks continues to share specific vulnerabilities with companies so they can fix them before the details are leaked to the general public, the ability of security companies like Symantec to link the CIA to known hacking operations could prove to be even more enlightening as to the scope of CIA cyber-espionage the world over.

In early 2012, members of the hacking collective Anonymous carried out a series of cyber attacks on government and corporate websites in Brazil. They did so under the direction of a hacker who, unbeknownst to them, was wearing another hat: helping the Federal Bureau of Investigation carry out one of its biggest cybercrime investigations to date. A year after leaked files exposed the National Security Agency's efforts to spy on citizens and companies in Brazil, previously unpublished chat logs obtained by Motherboard reveal that while under the FBI's supervision, Hector Xavier Monsegur, widely known by his online persona, "Sabu," facilitated attacks that affected Brazilian websites. The operation raises questions about how the FBI uses global internet vulnerabilities during cybercrime investigations, how it works with informants, and how it shares information with other police and intelligence agencies. 

After his arrest in mid-2011, Monsegur continued to organize cyber attacks while working for the FBI. According to documents and interviews, Monsegur passed targets and exploits to hackers to disrupt government and corporate servers in Brazil and several other countries. Details about his work as a federal informant have been kept mostly secret, aired only in closed-door hearings and in redacted documents that include chat logs between Monsegur and other hackers. The chat logs remain under seal due to a protective order upheld in court, but in April, they and other court documents were obtained by journalists at Motherboard and the Daily Dot. 

The secretive British spy agency GCHQ has developed covert tools to seed the internet with false information, including the ability to manipulate the results of online polls, artificially inflate pageview counts on web sites, “amplif[y]” sanctioned messages on YouTube, and censor video content judged to be “extremist.” The capabilities, detailed in documents provided by NSA whistleblower Edward Snowden, even include an old standby for pre-adolescent prank callers everywhere: A way to connect two unsuspecting phone users together in a call.

he “tools” have been assigned boastful code names. They include invasive methods for online surveillance, as well as some of the very techniques that the U.S. and U.K. have harshly prosecuted young online activists for employing, including “distributed denial of service” attacks and “call bombing.” But they also describe previously unknown tactics for manipulating and distorting online political discourse and disseminating state propaganda, as well as the apparent ability to actively monitor Skype users in real-time—raising further questions about the extent of Microsoft’s cooperation with spy agencies or potential vulnerabilities in its Skype’s encryption. Here’s a list of how JTRIG describes its capabilities: • “Change outcome of online polls” (UNDERPASS) • “Mass delivery of email messaging to support an Information Operations campaign” (BADGER) and “mass delivery of SMS messages to support an Information Operations campaign” (WARPARTH) • “Disruption of video-based websites hosting extremist content through concerted target discovery and content removal.” (SILVERLORD)

• “Active skype capability. Provision of real time call records (SkypeOut and SkypetoSkype) and bidirectional instant messaging. Also contact lists.” (MINIATURE HERO) • “Find private photographs of targets on Facebook” (SPRING BISHOP) • “A tool that will permanently disable a target’s account on their computer” (ANGRY PIRATE) • “Ability to artificially increase traffic to a website” (GATEWAY) and “ability to inflate page views on websites” (SLIPSTREAM) • “Amplification of a given message, normally video, on popular multimedia websites (Youtube)” (GESTATOR) • “Targeted Denial Of Service against Web Servers” (PREDATORS FACE) and “Distributed denial of service using P2P. Built by ICTR, deployed by JTRIG” (ROLLING THUNDER)

We can't choose a world where the US gets to spy but China doesn't, or even a world where governments get to spy and criminals don't. We need to choose, as a matter of policy, communications systems that are secure for all users, or ones that are vulnerable to all attackers. It's security or surveillance.

The Intercept published an expose on the NSA's XKeyscore program. Along with information on the breadth and scale of the NSA's metadata collection, The Intercept revealed how the NSA relies on unencrypted cookie data to identify users. As The Intercept says: "The NSA’s ability to piggyback off of private companies’ tracking of their own users is a vital instrument that allows the agency to trace the data it collects to individual users. It makes no difference if visitors switch to public Wi-Fi networks or connect to VPNs to change their IP addresses: the tracking cookie will follow them around as long as they are using the same web browser and fail to clear their cookies." The NSA slides released by The Intercept give detailed guides to understanding the data transmitted by these cookies, as well as how to find unique machine identifiers that analysts can use to differentiate between multiple machines using the same IP address. We've written before about how spy agencies piggyback on social media account data to find Internet users' names or other identifying info, and these slides drive home the point that HTTP cookies leave users vulnerable to government surveillance, since any intermediary (or spy agency) can read the sensitive data they contain.

Worse yet, most of the time these identifying cookies come from third-party sources on webpages, and users have no meaningful way to opt out of receiving them (short of blocking all third party cookies) since advertisers (the main server of these types of cookies) refuse to honor the Do Not Track header.  Browser makers could help address this sort of non-consensual tracking by both advertisers and the NSA with some simple technical changes—changes that have been shown to reduce the number of third party cookies received by 67%. So far, though, they've been unwilling to build privacy protecting features in by default. Until they do, the best way for users to protect themselves is by installing a privacy protecting app like Privacy Badger, which is designed to block these types of uniquely identifying tracking cookies, or HTTPS Everywhere to block the transmission of HTTP cookies.

Back in 2011, Julian Assange met up with Eric Schmidt for an interview that he considers the best he’s ever given. That doesn’t change, however, the opinion he now has about Schmidt and the company he represents, Google.In fact, the WikiLeaks leader doesn’t believe in the famous “Don’t Be Evil” mantra that Google has been preaching for years.Assange thinks both Schmidt and Google are at the exact opposite spectrum.“Nobody wants to acknowledge that Google has grown big and bad. But it has. Schmidt’s tenure as CEO saw Google integrate with the shadiest of US power structures as it expanded into a geographically invasive megacorporation. But Google has always been comfortable with this proximity,” Assange writes in an opinion piece for Newsweek.

“Long before company founders Larry Page and Sergey Brin hired Schmidt in 2001, their initial research upon which Google was based had been partly funded by the Defense Advanced Research Projects Agency (DARPA). And even as Schmidt’s Google developed an image as the overly friendly giant of global tech, it was building a close relationship with the intelligence community,” Assange continues.Throughout the lengthy article, Assange goes on to explain how the 2011 meeting came to be and talks about the people the Google executive chairman brought along - Lisa Shields, then vice president of the Council on Foreign Relationship, Jared Cohen, who would later become the director of Google Ideas, and Scott Malcomson, the book’s editor, who would later become the speechwriter and principal advisor to Susan Rice.“At this point, the delegation was one part Google, three parts US foreign-policy establishment, but I was still none the wiser.” Assange goes on to explain the work Cohen was doing for the government prior to his appointment at Google and just how Schmidt himself plays a bigger role than previously thought.In fact, he says that his original image of Schmidt, as a politically unambitious Silicon Valley engineer, “a relic of the good old days of computer science graduate culture on the West Coast,” was wrong.

However, Assange concedes that that is not the sort of person who attends Bilderberg conferences, who regularly visits the White House, and who delivers speeches at the Davos Economic Forum.He claims that Schmidt’s emergence as Google’s “foreign minister” did not come out of nowhere, but it was “presaged by years of assimilation within US establishment networks of reputation and influence.” Assange makes further accusations that, well before Prism had even been dreamed of, the NSA was already systematically violating the Foreign Intelligence Surveillance Act under its director at the time, Michael Hayden. He states, however, that during the same period, namely around 2003, Google was accepting NSA money to provide the agency with search tools for its rapidly-growing database of information.Assange continues by saying that in 2008, Google helped launch the NGA spy satellite, the GeoEye-1, into space and that the search giant shares the photographs from the satellite with the US military and intelligence communities. Later on, 2010, after the Chinese government was accused of hacking Google, the company entered into a “formal information-sharing” relationship with the NSA, which would allow the NSA’s experts to evaluate the vulnerabilities in Google’s hardware and software.

After months of deliberation, the Obama administration has made a long-awaited decision on the thorny issue of how to deal with encrypted communications: It will not — for now — call for legislation requiring companies to decode messages for law enforcement. Rather, the administration will continue trying to persuade companies that have moved to encrypt their customers’ data to create a way for the government to still peer into people’s data when needed for criminal or terrorism investigations. “The administration has decided not to seek a legislative remedy now, but it makes sense to continue the conversations with industry,” FBI Director James B. Comey said at a Senate hearing Thursday of the Homeland Security and Governmental Affairs Committee.

The decision, which essentially maintains the status quo, underscores the bind the administration is in — balancing competing pressures to help law enforcement and protect consumer privacy. The FBI says it is facing an increasing challenge posed by the encryption of communications of criminals, terrorists and spies. A growing number of companies have begun to offer encryption in which the only people who can read a message, for instance, are the person who sent it and the person who received it. Or, in the case of a device, only the device owner has access to the data. In such cases, the companies themselves lack “backdoors” or keys to decrypt the data for government investigators, even when served with search warrants or intercept orders.

The decision was made at a Cabinet meeting Oct. 1. “As the president has said, the United States will work to ensure that malicious actors can be held to account — without weakening our commitment to strong encryption,” National Security Council spokesman Mark Stroh said. “As part of those efforts, we are actively engaged with private companies to ensure they understand the public safety and national security risks that result from malicious actors’ use of their encrypted products and services.” But privacy advocates are concerned that the administration’s definition of strong encryption also could include a system in which a company holds a decryption key or can retrieve unencrypted communications from its servers for law enforcement. “The government should not erode the security of our devices or applications, pressure companies to keep and allow government access to our data, mandate implementation of vulnerabilities or backdoors into products, or have disproportionate access to the keys to private data,” said Savecrypto.org, a coalition of industry and privacy groups that has launched a campaign to petition the Obama administration.

Europe’s highest court on Tuesday struck down an international agreement that allowed companies to move digital information like people’s web search histories and social media updates between the European Union and the United States. The decision left the international operations of companies like Google and Facebook in a sort of legal limbo even as their services continued working as usual.The ruling, by the European Court of Justice, said the so-called safe harbor agreement was flawed because it allowed American government authorities to gain routine access to Europeans’ online information. The court said leaks from Edward J. Snowden, the former contractor for the National Security Agency, made it clear that American intelligence agencies had almost unfettered access to the data, infringing on Europeans’ rights to privacy. The court said data protection regulators in each of the European Union’s 28 countries should have oversight over how companies collect and use online information of their countries’ citizens. European countries have widely varying stances towards privacy.

Data protection advocates hailed the ruling. Industry executives and trade groups, though, said the decision left a huge amount of uncertainty for big companies, many of which rely on the easy flow of data for lucrative businesses like online advertising. They called on the European Commission to complete a new safe harbor agreement with the United States, a deal that has been negotiated for more than two years and could limit the fallout from the court’s decision.

Some European officials and many of the big technology companies, including Facebook and Microsoft, tried to play down the impact of the ruling. The companies kept their services running, saying that other agreements with the European Union should provide an adequate legal foundation.But those other agreements are now expected to be examined and questioned by some of Europe’s national privacy watchdogs. The potential inquiries could make it hard for companies to transfer Europeans’ information overseas under the current data arrangements. And the ruling appeared to leave smaller companies with fewer legal resources vulnerable to potential privacy violations.