The USA can ban you

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GCHQ faces legal challenge in European court over online privacy

Campaigners accuse British spy agency of breaching privacy of millions in UK and Europe via online surveillance.

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Lavabit founder refused FBI order to hand over email encryption keys

Unsealed documents show Ladar Levison, now subject of government gag order, refused requests to 'defeat its own system'.

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NSA and GCHQ target Tor network that protects anonymity of web users

- Top-secret documents detail repeated efforts to crack Tor.

- US-funded tool relied upon by dissidents and activists.

- Core security of network remains intact but NSA has some success attacking users' computers.

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Attacking Tor: how the NSA targets users' online anonymity

Secret servers and a privileged position on the internet's backbone used to identify users and attack target computers.

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Why the NSA's attacks on the internet must be made public

By reporting on the agency's actions, the vulnerabilities in our computer systems can be fixed. It's the only way to force change.

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German intelligence service is as bad as the NSA

There has been much criticism of the US agency in Germany, but surveillance laws in both countries fail to protect internet privacy.

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The Snowden files: why the British public should be worried about GCHQ

When the Guardian offered John Lanchester access to the GCHQ files, the journalist and novelist was initially unconvinced. But what the papers told him was alarming: that Britain is sliding towards an entirely new kind of surveillance society.

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The NSA debate is as much about journalism as surveillance

A 14-minute interview on BBC highlights the debate over the proper relationship between journalists and government.

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Edward Snowden should be put on kill list, joke US intelligence chiefs

Former NSA and CIA chief and chair of House intelligence committee in jovial mood at 2013 Cybersecurity Summit.

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NSA chief admits agency tracked US cellphone locations in secret tests

Keith Alexander insists pilot programs were not used for analysis but that tracking location data 'may be a future requirement'.

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Obama's efforts to control leaks 'most aggressive since Nixon', report finds

Administration's tactics, which include using Espionage Act to pursue leakers, have had chilling effect on accountability – study.

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UK debate grows over 'Orwellian' NSA and GCHQ surveillance

MI5 director's speech gets backing of prime minister as Guardian editor warns over suppressing dissent.

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The double danger of the NSA's 'collect it all' policy on surveillance

Security agencies now sweep up such a giant haystack of data, infringing innocent citizens' rights, that they can't find the needles.

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Editors on the NSA files: 'What the Guardian is doing is important for democracy'

On Thursday the Daily Mail described the Guardian as 'The paper that helps Britain's enemies'. We showed that article to many of the world's leading editors. This is what they said.

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Surveillance, democracy, transparency – a global view

From internet leaders Tim Berners-Lee and Mark Zuckerberg, to the leaders of Brazil and US national intelligence, Dilma Rousseff and James Clapper, powerful voices in politics, culture and academia are recognising the need for debate on state surveillance.

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Committee to Protect Journalists issues scathing report on Obama administration

Obama's anti-press measures 'are the most aggressive I've seen since the Nixon administration'.

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Edward Snowden says NSA surveillance programmes 'hurt our country'

Video clips posted to WikiLeaks website show former NSA analyst speaking for the first time since July asylum plea.

Edward Snowden awarded the Sam Adams prize for integrity in intelligence - video

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US fears back-door routes into the net because it's building them too

If the Snowden revelations have taught us anything, it's that the NSA has been up to the sort of covert practices it claims to be so concerned about.

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Guardian was 'entirely correct' to publish NSA stories, says Vince Cable

Business secretary confirms Nick Clegg is to launch review of oversight of intelligence agencies.

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New York Times says UK tried to get it to hand over Snowden documents

Jill Abramson says she was approached by UK embassy officials after announcing collaboration with Guardian over NSA files.