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Tracking Censorship and Surveillance

ProPublica investigates the threats to privacy in an era of cellphones, data mining and cyberwar, including how citizens are digitally tracked by governments and corporations.

Podcast: Spying with Avatars

World of Spycraft: NSA and CIA Spied in Online Games

Snowden documents show intelligence agencies conducting surveillance and grabbing data in virtual worlds.

新浪微博:遭遇中国式审查

近五个月来,我们关注了100个新浪微博账号,收集了所有附带图片于被删除的微博信息。这些删除的图片并让我们更加了解中国如何运转这一庞大的审查系统。

China’s Memory Hole: The Images Erased From Sina Weibo

ProPublica has been collecting images that have been deleted by censors from Sina Weibo, "China’s Twitter," since May. We gathered a team of people proficient in Mandarin to read and interpret 527 deleted images collected during a two-week window this summer. The images provide a window into the Chinese elite’s self-image and its fears, as well as a lens through which to understand China’s vast system of censorship.

How to Get Censored on China’s Twitter

For five months, we’ve been observing 100 accounts on Sina Weibo, “China’s Twitter,” keeping track of images that are deleted by censors. Those deleted images provide a window onto China’s vast system of censorship.

NIST to Review Standards After Cryptographers Cry Foul Over NSA Meddling

The federal institute that sets national standards for data encryption has announced it is reviewing all of its previous recommendations.

Claim on “Attacks Thwarted” by NSA Spreads Despite Lack of Evidence

The agency, President Obama, and members of Congress have all said NSA spying programs have thwarted more than 50 terrorist plots. But there’s no evidence the claim is true.

Government Standards Agency “Strongly” Suggests Dropping its Own Encryption Standard

The decision follows revelations about the NSA’s covert influence on computer security standards.

Johns Hopkins and the Case of the Missing NSA Blog Post

The university, which works closely with the NSA, apologizes to a professor after he was asked to remove his post.

Revealed: The NSA's Secret Campaign to Crack, Undermine Internet Security

Newly revealed documents show that the NSA has circumvented or cracked much of the encryption that automatically secures the emails, Web searches, Internet chats and phone calls of Americans and others around the world. The project, referred to internally by the codename Bullrun, also includes efforts to weaken the encryption standards adopted by software developers.

Why We Published the Decryption Story

We explain why publishing this story about U.S. and U.K. government efforts to decode enormous amounts of internet traffic previously thought to have been safe is in the public interest.

The Surveillance Reforms Obama Supported Before He Was President

The White House has opposed efforts to rein in NSA snooping, but only five years ago, Sen. Obama supported substantial reforms.

FAQ: What You Need to Know About the NSA's Surveillance Programs

A detailed snapshot of what's known about the NSA surveillance programs.

Six Ways Congress May Reform NSA Snooping

A measure to end one NSA program was just defeated in the House by a surprisingly narrow margin. Here are other proposals on the table.

NSA Says It Can't Search Its Own Emails

In response to a public records request, the super-snooping spy agency says it doesn’t have the technology.

Does the NSA Tap That? What We Still Don’t Know About the Agency’s Internet Surveillance

In a secret effort, the National Security Agency appears to be vacuuming up large swathes of the Internet.

How the NSA’s High-Tech Surveillance Helped Europeans Catch Terrorists

The debate about National Security Agency eavesdropping has left European investigators bemused. U.S. technology collects mountains of data that often aids their cases, they say. But there's no substitute for real human spying.

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Defenders of NSA Surveillance Omit Most of Mumbai Plotter's Story

Officials say National Security Agency intercepts stopped David Coleman Headley's planned attack in Denmark, but sources say a tip from the British led to his capture after the U.S. failed for years to connect multiple reports of terror ties.

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