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Thousands of people are signing up to join an unprecedented legal campaign against the United Kingdom’s leading electronic surveillance agency. On Monday, London-based human rights group Privacy International launched an initiative enabling anyone across the world to challenge covert spying operations involving Government Communications Headquarters, or GCHQ, the National Security Agency’s British counterpart. The campaign was made possible following a historic court ruling earlier this month that deemed intelligence sharing between GCHQ and the NSA to have been unlawful because of the extreme secrecy shrouding it.

Consequently, members of the public now have a rare opportunity to take part in a lawsuit against the spying in the Investigatory Powers Tribunal, a special British court that handles complaints about surveillance operations conducted by law enforcement and intelligence agencies. Privacy International is allowing anyone who wants to participate to submit their name, email address and phone number through a page on its website. The group plans to use the details to lodge a case with GCHQ and the court that will seek to discover whether each participant’s emails or phone calls have been covertly obtained by the agency in violation of the privacy and freedom of expression provisions of the European Convention on Human Rights. If it is established that any of the communications have been unlawfully collected, the court could force GCHQ to delete them from its vast repositories of intercepted data.

By Tuesday evening, more than 10,000 people had already signed up to the campaign, a spokesman for Privacy International told The Intercept. In a statement announcing the campaign on Monday, Eric King, deputy director of Privacy International, said: “The public have a right to know if they were illegally spied on, and GCHQ must come clean on whose records they hold that they should never have had in the first place. “We have known for some time that the NSA and GCHQ have been engaged in mass surveillance, but never before could anyone explicitly find out if their phone calls, emails, or location histories were unlawfully shared between the U.S. and U.K. “There are few chances that people have to directly challenge the seemingly unrestrained surveillance state, but individuals now have a historic opportunity finally hold GCHQ accountable for their unlawful actions.”

The nation’s top technology firms and a coalition of privacy groups are urging Congress to place curbs on government surveillance in the face of a fast-approaching deadline for legislative action. A set of key Patriot Act surveillance authorities expire June 1, but the effective date is May 21 — the last day before Congress breaks for a Memorial Day recess. In a letter to be sent Wednesday to the Obama administration and senior lawmakers, the coalition vowed to oppose any legislation that, among other things, does not ban the “bulk collection” of Americans’ phone records and other data.

We know that there are some in Congress who think that they can get away with reauthorizing the expiring provisions of the Patriot Act without any reforms at all,” said Kevin Bankston, policy director of New America Foundation’s Open Technology Institute, a privacy group that organized the effort. “This letter draws a line in the sand that makes clear that the privacy community and the Internet industry do not intend to let that happen without a fight.” At issue is the bulk collection of Americans’ data by intelligence agencies such as the National Security Agency. The NSA’s daily gathering of millions of records logging phone call times, lengths and other “metadata” stirred controversy when it was revealed in June 2013 by former NSA contractor Edward Snowden. The records are placed in a database that can, with a judge’s permission, be searched for links to foreign terrorists.They do not include the content of conversations.

That program, placed under federal surveillance court oversight in 2006, was authorized by the court in secret under Section 215 of the Patriot Act — one of the expiring provisions. The public outcry that ensued after the program was disclosed forced President Obama in January 2014 to call for an end to the NSA’s storage of the data. He also appealed to Congress to find a way to preserve the agency’s access to the data for counterterrorism information.

In a post on Wednesday, researchers Alex Halderman and Nadia Heninger presented compelling research suggesting that the NSA has developed the capability to decrypt a large number of HTTPS, SSH, and VPN connections using an attack on common implementations of the Diffie-Hellman key exchange algorithm with 1024-bit primes. Earlier in the year, they were part of a research group that published a study of the Logjam attack, which leveraged overlooked and outdated code to enforce "export-grade" (downgraded, 512-bit) parameters for Diffie-Hellman. By performing a cost analysis of the algorithm with stronger 1024-bit parameters and comparing that with what we know of the NSA "black budget" (and reading between the lines of several leaked documents about NSA interception capabilities) they concluded that it's likely NSA has been breaking 1024-bit Diffie-Hellman for some time now. The good news is, in the time since this research was originally published, the major browser vendors (IE, Chrome, and Firefox) have removed support for 512-bit Diffie-Hellman, addressing the biggest vulnerability. However, 1024-bit Diffie-Hellman remains supported for the forseeable future despite its vulnerability to NSA surveillance. In this post, we present some practical tips to protect yourself from the surveillance machine, whether you're using a web browser, an SSH client, or VPN software. Disclaimer: This is not a complete guide, and not all software is covered.