Signal Foundation warns encrypted messaging app will abandon European market rather than comply with mass surveillance regulation as crucial October 14 vote approaches

The Signal Foundation has issued a stark ultimatum to Germany and the European Union: the encrypted messaging platform will exit the EU market entirely rather than comply with the proposed Chat Control regulation that requires mass scanning of private communications.

In a strongly-worded statement published Friday, Signal Foundation President Meredith Whittaker directly appealed to Germany to reject the controversial measure, warning that the country faces a “catastrophic about-face” if it reverses its longstanding opposition to the regulation ahead of the critical October 14 vote.

Germany Holds the Swing Vote

Germany’s position has become the decisive factor in determining whether Chat Control becomes law across the European Union. The country’s 83 million citizens would push the supporting bloc to approximately 71% of the EU population—well above the 65% threshold required for passage under the EU’s qualified majority voting system.

Currently, 15 EU member states support the Danish-led proposal, but without Germany, they represent less than the required population threshold. Meanwhile, eight countries actively oppose the measure, including the Czech Republic, Finland, Estonia, Austria, the Netherlands, Poland, Luxembourg, and Slovakia.

The uncertainty surrounding Germany’s stance has alarmed privacy advocates. While the previous German government strongly opposed Chat Control and sought to make encryption a legal right, the current coalition led by Chancellor Friedrich Merz has declined to publicly announce its voting position, despite the Interior Ministry, Justice Ministry, and Digital Minister all expressing concerns about breaking end-to-end encryption.

What Chat Control Would Require

First introduced in 2022 as the Regulation to Prevent and Combat Child Sexual Abuse (CSAR), Chat Control would mandate that service providers—including end-to-end encrypted platforms like Signal, WhatsApp, and Telegram—implement systems to scan all communications before messages are sent.

The latest version of the proposal, circulated by Denmark’s EU Council presidency in July 2025, would require:

  • Client-side scanning of every message, photo, and video on users’ devices before encryption- Assessment of content via government-mandated databases or AI models- Detection of visual content including images, videos, and URLs- Age verification systems that could eliminate anonymity

“Under the guise of protecting children, the latest Chat Control proposals would require mass scanning of every message, photo, and video on a person’s device, assessing these via a government-mandated database or AI model to determine whether they are permissible content or not,” Whittaker wrote in her appeal to Germany.

Signal’s Existential Threat

For Signal, which has built its reputation on providing truly private communications, Chat Control represents an existential crisis. The company has already faced sophisticated attacks on its encrypted messaging system, making the preservation of end-to-end encryption even more critical. Whittaker emphasized that the company will not compromise on its core mission.

“We do one thing and we do it very very well: we provide the world’s largest truly private communications platform,” she stated. “And we know that encryption either works for everyone, or it doesn’t work for anyone; a backdoor in one part of a network is a vector into every other part.”

The Signal president made clear that the choice is binary: “If we were given a choice between building a surveillance machine into Signal or leaving the market, we would leave the market. This is not a choice we would make lightly, and our great hope is we never have to face it. But if Chat Control were enforced against us, that’s likely where we would end up.”

Technical Consensus Against Chat Control

Whittaker’s warning echoes concerns raised by the broader technical community. In September 2025, more than 500 cryptographers, security researchers, and computer scientists from 34 countries signed an open letter declaring Chat Control “technically infeasible” and warning it would create “unprecedented capabilities for surveillance, control, and censorship.”

Belgian cryptographer Bart Preenel of Leuven University, who organized the letter, dismissed recent modifications to the proposal as “just smoke and mirrors,” arguing that the fundamental flaws remain.

The technical experts outlined several critical problems:

Encryption is fundamentally incompatible with scanning: “Scanning every message—whether you do it before, or after these messages are encrypted—negates the very premise of end-to-end encryption,” Whittaker explained. Rather than having to break Signal’s encryption protocol, attackers and hostile nation states would only need to “piggyback on the access granted to the scanning system.”

High error rates and false positives: Researchers warn that automated detection systems produce unacceptably high false positive rates. German police data from 2024 showed that 99,375 private chats and photos of innocent people were wrongly reported under existing voluntary scanning—a 9% increase from the previous year. In Ireland, only 852 of 4,192 automated reports in 2022 involved illegal content.

Easy to evade: The scientists’ open letter states bluntly: “There is no machine-learning algorithm that can detect unknown CSAM without committing a large number of errors. All known algorithms are fundamentally susceptible to evasion.”

National security risks: Even intelligence agencies have reportedly agreed that creating backdoors for scanning would be “catastrophic for national security,” as it would compromise the confidential communications of government officials, military personnel, and intelligence officers. The vulnerability of encrypted communications to state actors has been demonstrated repeatedly in recent months, making the protection of encryption more critical than ever.

Political Pressure and Denmark’s Push

Denmark assumed the EU Council presidency on July 1, 2025, and immediately made Chat Control a legislative priority, targeting the October 14 adoption date. The Danish presidency has been actively working to convince undecided member states to support the measure.

France, which previously opposed the regulation, reversed its position in July 2025 and now supports both mandatory chat control and client-side scanning. This shift created momentum for the 15 member states currently backing the proposal, which also include Cyprus, Hungary, Ireland, Lithuania, Malta, Portugal, Romania, and Spain.

Critics, including former German MEP Patrick Breyer, have accused the Danish presidency of using “political blackmail” by falsely claiming that the European Parliament would refuse to extend voluntary scanning provisions if the Council didn’t reach agreement. Breyer called this “a blatant lie” and “a shameless disinformation campaign to force an unprecedented mass scanning law upon 450 million Europeans.”

Opposition Grows But Remains Uncertain

While opposition has been growing—with countries citing concerns over mass surveillance, constitutional issues, and encryption undermining—the outcome remains uncertain.

The Czech Republic announced total opposition on August 26, 2025, with Prime Minister Petr Fiala speaking on behalf of the entire coalition government. Finland cannot support the proposal due to constitutionally problematic identification orders. Belgium deemed the bill “a monster that invades your privacy and cannot be tamed.”

However, several countries including Belgium, Italy, Latvia, and Sweden have shifted positions or remain undecided as Denmark intensifies pressure ahead of the vote.

Historical Context and Stakes

Whittaker pointedly invoked Germany’s historical experience with mass surveillance under the Stasi secret police, urging the country to draw on “its own history of the terrible harm that can be facilitated by mass surveillance.”

“To capitulate now, at a time of great geopolitical uncertainty where the cybersecurity of our core infrastructures matters more than ever, would be an incomprehensible strategic blunder, and a fundamental betrayal of Europe’s commitment to learn from history,” she wrote.

The Signal president characterized the proposal as opening “a mass surveillance free-for-all, opening up everyone’s intimate and confidential communications, whether government officials, military, investigative journalists, or activists.” This echoes similar concerns about surveillance expansion across Europe, where multiple governments are moving to monitor private communications under various pretexts.

What’s Next

The final vote is scheduled for October 14, 2025, at the EU Council’s Justice and Home Affairs meeting. If the regulation passes the Council, it would proceed to trilogue negotiations with the European Parliament and Commission in early 2026.

Advocacy organizations including European Digital Rights (EDRi), the Electronic Frontier Foundation, and the Fight Chat Control campaign are urging citizens to contact their government representatives to oppose the measure. The Fight Chat Control website provides tools for Europeans to easily reach their officials.

Meanwhile, other encrypted messaging providers have also voiced opposition to Chat Control. German encrypted email provider Tuta Mail has stated it will take legal action against the EU if the proposals are adopted. However, larger platforms like WhatsApp and Telegram have not made public commitments to leave the market, though both have condemned the regulation.

For Signal, the stakes couldn’t be clearer. As Whittaker concluded: “We urge Germany to be wise and to stand firm in its principles. We cannot let history repeat itself, this time with bigger databases and much much more sensitive data.”

The October 14 vote will determine not only the fate of private communications in Europe but could set a global precedent for how democracies balance child protection with fundamental rights to privacy and secure communication.

The final EU Council vote on Chat Control is scheduled for October 14, 2025. Citizens can learn more and contact their representatives through the Fight Chat Control campaign at fightchatcontrol.eu.

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