Cybersecurity Experts Warn EU Against Chat Control 2.0 Regulation Ahead of Key Votes

More than 500 scientists denounce EU’s encrypted message scanning as “technically infeasible.”

By Ken Macon

A group of more than 500 experts in cybersecurity, cryptography, and computer science from 34 countries has issued a clear warning against the European Union’s proposed Chat Control 2.0 regulation.

In a joint open letter, the signatories describe the plan as “technically infeasible” and caution that it would open the door to “unprecedented capabilities for surveillance, control, and censorship.”

We obtained a copy of the open letter for you here.

Their statement arrives just days ahead of a critical European Council meeting on September 12, with a final vote set for October 14 that will determine whether the regulation moves forward.

The proposed law would compel messaging apps, email platforms, cloud services, and even providers of end-to-end encrypted communication to scan all user content automatically. This would apply to texts, images, and videos, whether or not there is any suspicion of wrongdoing.

According to the researchers, such detection systems cannot coexist with secure communication. “On‑device detection, regardless of its technical implementation, inherently undermines the protections that end‑to‑end encryption is designed to guarantee.”

By forcing companies to monitor encrypted content, the regulation would introduce security weaknesses that could be exploited by malicious actors and hostile governments.

The scientists also emphasize the inaccuracy of the proposed approach. They argue that large-scale scanning systems produce unacceptable error rates and could generate enormous numbers of false reports.

“Existing research confirms that state‑of‑the‑art detectors would yield unacceptably high false positive and false negative rates, making them unsuitable for large‑scale detection campaigns at the scale of hundreds of millions of users.”