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Key senators and corporate executives warned at a hearing on Tuesday that the “scope and scale” of the hacking of government agencies and companies, the most sophisticated in history, were still unclear.

Telegram and Signal, the encrypted services that keep conversations confidential, are increasingly popular. Our tech columnists discuss whether this could get ugly.

Requiring that app makers list the data they collect reveals a lot about what some apps do with our information (ahem, WhatsApp) but creates confusion about others.

The social network, popular with President Trump’s supporters, went offline last week after it was kicked off Amazon’s servers.

The encrypted messaging services have become the world’s hottest apps over the last week, driven by growing anxiety over the power of the biggest tech companies and privacy concerns.

Bitcoin owners are getting rich because the cryptocurrency has soared. But what happens when you can’t tap that wealth because you forgot the password to your digital wallet?

Tim Berners-Lee wants to put people in control of their personal data. He has technology and a start-up pursuing that goal. Can he succeed?

Users of major mobile carriers can no longer access a service that detailed the personal information of police officers, a possible sign that the city is turning to tactics used in mainland China.

The hackers gained more access than the company previously understood, though they were unable to modify code or access its products and emails.

U.S. prosecutors have charged a company executive based in China with conspiring to terminate online meetings about the Tiananmen Square massacre.

Minutes after the government statement, President-elect Joseph R. Biden Jr. warned that his administration would impose “substantial costs” on those responsible. President Trump has been silent on the hacking.

The Pentagon, intelligence agencies, nuclear labs and Fortune 500 companies use software that was found to have been compromised by Russian hackers. The sweep of stolen data is still being assessed.

The Silicon Valley company said hackers — almost certainly Russian — made off with tools that could be used to mount new attacks around the world.

The attack, first discovered late Tuesday, disrupted the district’s websites and remote learning programs, as well as its grading and email systems, officials said.

Some Republicans have blamed software glitches for vote-count issues in Michigan and Georgia. The Michigan cases were caused by human error and soon fixed, while Georgia software issues didn’t affect tallies.

Government officials warned that hackers were seeking to hold American hospitals’ data hostage in exchange for ransom payments.

The defacement lasted less than 30 minutes, and the hackers appeared to be looking to generate cryptocurrency.