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Terrorists and child sex rings could be uncovered through their internet discussions as part of a tough set of security measures to be unveiled by Home Secretary Theresa May this week. Major online service providers, such as Google, will be legally obliged to retain a log of users and the mobile phones or computers they have accessed in case police and security agencies later need the information to help them locate criminals. This measure will be included in the Counter-terrorism and Security Bill that is being introduced in the wake of Isis’s beheadings of prisoners, including British aid workers David Haines and Alan Henning, this year

Gagging orders in the FBI's National Security Letters are all above board and constitutional, a California court has ruled. These security letters are typically sent to internet giants demanding information on whoever is behind a username or email address. Crucially, these requests include clauses that prevent the organizations from warning specific subscribers that they are under surveillance by the Feds. Cloudflare and Credo Mobile aren't happy with that, and – with the help of rights warriors at the EFF – challenged the gagging orders. Despite earlier successes in their legal battle, the 9th US Circuit Court of Appeals ruled [PDF] on Monday that the gagging orders do not trample on First Amendment rights.

The FBI dishes out thousands of National Security Letters (NSLs) every year; they can simply be issued by a special agent in charge in a bureau field office, and don’t require judicial review. They allow the Feds to obtain the name, address, and records of any services used – but not the contents of conversations – plus billing records of a person, and forbid the hosting company from telling the subject, meaning those under investigation can’t challenge the decision. It used to be the case that companies couldn’t even mention the existence of the NSL system for fear of prosecution. However, in 2013 a US district court in San Francisco ruled that such extreme gagging violated the First Amendment. That decision came after Google, and later others, started publishing the number of NSL orders that had been received, in defiance of the law. In 2015 the Obama administration amended the law to allow companies limited rights to disclose NSL orders, and to set a three-year limit for the gagging order. It also set up a framework for companies to challenge the legitimacy of NSL subpoenas, and it was these changes that caused the appeals court verdict in favor of the government.

Imagine if someone could scan every image on Facebook, Twitter, and Instagram, then instantly determine where each was taken. The ability to combine this location data with information about who appears in those photos—and any social media contacts tied to them—would make it possible for government agencies to quickly track terrorist groups posting propaganda photos. (And, really, just about anyone else.) That's precisely the goal of Finder, a research program of the Intelligence Advanced Research Projects Agency (IARPA), the Office of the Director of National Intelligence's dedicated research organization. For many photos taken with smartphones (and with some consumer cameras), geolocation information is saved with the image by default. The location is stored in the Exif (Exchangable Image File Format) data of the photo itself unless geolocation services are turned off. If you have used Apple's iCloud photo store or Google Photos, you've probably created a rich map of your pattern of life through geotagged metadata. However, this location data is pruned off for privacy reasons when images are uploaded to some social media services, and privacy-conscious photographers (particularly those concerned about potential drone strikes) will purposely disable geotagging on their devices and social media accounts.

These and other classified documents provided by former NSA contractor Edward Snowden reveal that the NSA has developed technology not just to record and transcribe private conversations but to automatically identify the speakers. Americans most regularly encounter this technology, known as speaker recognition, or speaker identification, when they wake up Amazon’s Alexa or call their bank. But a decade before voice commands like “Hello Siri” and “OK Google” became common household phrases, the NSA was using speaker recognition to monitor terrorists, politicians, drug lords, spies, and even agency employees. The technology works by analyzing the physical and behavioral features that make each person’s voice distinctive, such as the pitch, shape of the mouth, and length of the larynx. An algorithm then creates a dynamic computer model of the individual’s vocal characteristics. This is what’s popularly referred to as a “voiceprint.” The entire process — capturing a few spoken words, turning those words into a voiceprint, and comparing that representation to other “voiceprints” already stored in the database — can happen almost instantaneously. Although the NSA is known to rely on finger and face prints to identify targets, voiceprints, according to a 2008 agency document, are “where NSA reigns supreme.” It’s not difficult to see why. By intercepting and recording millions of overseas telephone conversations, video teleconferences, and internet calls — in addition to capturing, with or without warrants, the domestic conversations of Americans — the NSA has built an unrivaled collection of distinct voices. Documents from the Snowden archive reveal that analysts fed some of these recordings to speaker recognition algorithms that could connect individuals to their past utterances, even when they had used unknown phone numbers, secret code words, or multiple languages.

The classified documents, dating from 2004 to 2012, show the NSA refining increasingly sophisticated iterations of its speaker recognition technology. They confirm the uses of speaker recognition in counterterrorism operations and overseas drug busts. And they suggest that the agency planned to deploy the technology not just to retroactively identify spies like Pelton but to prevent whistleblowers like Snowden.