By Robert McMillan, Jeff Horwitz and Dustin Volz 

U.S. Attorney General William Barr has asked Facebook Inc. to hold off on plans to add encryption throughout its messaging services, citing public safety in a push to force the social-media giant to delay a major strategic shift outlined by Chief Executive Mark Zuckerberg earlier this year.

Mr. Barr made the request in an open letter signed by his British and Australian counterparts that was published Friday. The letter asks the company to delay the encryption plan until it figures out a way to provide government access to the services for investigative purposes.

"Companies cannot operate with impunity where lives and the safety of our children is at stake, and if Mr. Zuckerberg really has a credible plan to protect Facebook's more than two billion users it's time he let us know what it is," Mr. Barr's letter says.

Mr. Zuckerberg, at an internal town hall late Thursday, said the challenges encryption poses to law enforcement were akin to "fighting that battle at least with a hand tied behind your back." But he reiterated that he believes the benefits of encryption in strengthening privacy outweigh the drawbacks.

Mr. Barr also signed an agreement with the U.K. that would make it quicker for British police to request data from internet companies by circumventing the Justice Department and going to firms directly.

Mr. Barr's salvo reignites a long-running dispute between technology companies and law enforcement over encrypted communications. In 2016, the Justice Department filed suit, requesting access to the encrypted iPhone of San Bernardino, Calif., shooter Syed Rizwan Farook. Apple Inc. pushed back, and the suit was dropped when investigators used another method to obtain access to the phone.

The federal government has avoided additional high-profile disputes with the technology industry over encryption since then, but Mr. Barr's letter represents a new effort against a Silicon Valley giant. It comes at a time when there is increased regulatory scrutiny of Facebook and other technology companies.

Despite the Justice Department's push, there remains no indication that Republican or Democratic lawmakers are interested in pursuing legislation to require tech companies to allow some form of government access to encrypted communications.

The prospect of a looming clash over encryption follows a fresh spate of setbacks for the company, which earlier Thursday lost a European Union court decision that gave judges broader power to order the removal of Facebook posts.

On Wednesday, the Journal reported that a Facebook-led coalition to build a global cryptocurrency-based payments network is starting to fray. Along with the encrypted-messaging push, libra is part of Mr. Zuckerberg's plan to move Facebook away from its almost complete dependence on targeted advertising on public platforms.

The tech industry has increasingly used encryption technology to protect the privacy of electronic communications after former National Security Agency contractor Edward Snowden released documents detailing U.S. government surveillance programs in 2013.

Encryption uses mathematical techniques to scramble digital files so that they are unreadable by anyone who doesn't have the digital keys required to unlock them. It is the technique that is used to protect data on Apple's iPhone and its iMessage system, and encryption is at the heart of Facebook's new messaging ambitions.

Technology companies have long argued that any technique that would give government access to these encryption systems would undermine their overall security and could ultimately be misused by hackers or spy agencies to steal data from consumers.

Even if this type of technique weren't misused, technology companies would likely face a barrage of requests from spy agencies and governments looking for information on opponents, critics said.

"How is Facebook to blindly distinguish what governments are to be permitted backdoor access to whichever conversations?" said Alec Muffett, a former Facebook engineer who worked on the company's encryption technology.

For Facebook, the encryption issue increasingly is at the heart of its business.

In March, Mr. Zuckerberg outlined a shift in corporate strategy to focus more on encrypted messaging and small-group chats, which he cast in part as a response to user demand for greater privacy.

The company's WhatsApp platform already is encrypted, and Mr. Zuckerberg said similar capabilities would be added across the company's other services.

Mr. Zuckerberg has acknowledged that extending encryption to the users of all Facebook products will come at a cost to user safety. But he has pledged to attempt to mitigate the harms when possible and said that, overall, people's ability to communicate privately must be protected.

At the internal town hall, which was livestreamed, Mr. Zuckerberg also observed the issue isn't Facebook's alone, saying that Apple's iMessage is the country's most popular messaging platform and is also encrypted.

Apple didn't respond to a request for comment.

The letter from Mr. Barr was also signed by Kevin McAleenan, acting secretary of homeland security, along with U.K. Home Secretary Priti Patel and Australia's Minister for Home Affairs Peter Dutton.

The push reflects a strategic pivot for the Justice Department, which historically sought to highlight how encryption stymied national security and terrorism investigations. Under Mr. Barr, the Justice Department has sought instead to emphasize the trouble law enforcement faces in pursuing child-exploitation cases, according to people familiar with the matter.

Asked about the messaging shift Thursday, a senior Justice Department official said encryption posed a problem regardless of the type of crime.

"My focus is on ensuring the public is safe," the official said.

Past efforts to find a compromise -- such as installing algorithmic filters on the front end of the WhatsApp -- have been rejected by Facebook.

"We would not pursue this approach," Facebook Vice President Will Cathcart wrote to Harvard University adjunct lecturer Bruce Schneier in August, describing it as both technologically problematic and vulnerable to government manipulation. Mr. Schneier had written that he believed Facebook was pursuing that approach.

The U.S. has a close intelligence-sharing relationship with the U.K. and Australia -- as well as with Canada and New Zealand -- known as the Five Eyes. The English-speaking countries also cooperate closely on law enforcement matters, and for years have wrestled with how to collectively confront increasingly pervasive encryption technology.

BuzzFeed News reported Mr. Barr's letter Thursday.

Mr. Barr and FBI Director Chris Wray are among several senior government officials scheduled to speak at a summit Friday about the challenges faced by law enforcement due to encryption, particularly as it relates to child exploitation.

At the news briefing, another senior Justice Department official said the administration wasn't ready to discuss specific legislative proposals.

There are steps that both sides of the encryption debate could take to reach compromise, said Alex Stamos, Facebook's former chief security officer. Facebook, for example, could use machine learning or new identification technology to spot exploitative messages sent within its encrypted systems.

That might weaken encryption, but it could address law-enforcement concerns without giving governments unfettered access to private information. "This is the start of a negotiation that our society has to do between privacy and safety," he said.

Write to Robert McMillan at Robert.Mcmillan@wsj.com and Dustin Volz at dustin.volz@wsj.com

 

(END) Dow Jones Newswires

October 04, 2019 06:40 ET (10:40 GMT)

Copyright (c) 2019 Dow Jones & Company, Inc.
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