Encryption Gaps in Satellite Systems Leave 40% of Earth Exposed

A new academic study has revealed a serious flaw in global satellite communications — vast amounts of unencrypted data, including personal messages and even military information, are being broadcast openly across the skies.

Researchers from the University of Maryland and the University of California stumbled upon the issue using little more than a $600 setup. With a simple satellite dish installed on a San Diego rooftop, the team intercepted transmissions from 39 geosynchronous satellites, discovering that a large share of the traffic — from cell encryption codes to critical infrastructure data — was sent in plain text.

Because these satellites cover nearly 40% of Earth’s surface, the exposed information could be monitored by anyone within range. “It doesn’t take a spy agency,” the researchers noted. “Just modest hardware and basic know-how.”

The Root of the Problem

The core issue, they explained, is inconsistent security practices among satellite service providers. Encrypting data increases costs, complicates maintenance, and can hinder real-time troubleshooting — prompting many operators to skip it altogether. In remote areas, even the necessary hardware can be prohibitively expensive. Some companies, the researchers said, simply fail to recognize how easy it is to intercept satellite signals.

What Users Can Do

To protect themselves, experts suggest relying on VPN services and secure messaging apps such as Signal or Telegram, which encrypt data end-to-end. The researchers stressed that encryption should be “a mandatory defense layer, not an optional upgrade,” calling for industry-wide standards to safeguard civilian and government communications alike.

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Industry Reaction

After being alerted, several major networks — including those used by T-Mobile, Walmart, and Alaska’s KPU — implemented fixes. Yet many vulnerabilities remain unaddressed, as investigations are ongoing. Because no single authority oversees satellite encryption, coordinating responses has proven slow and complex.

An Unsecured Frontier

The study focused exclusively on geosynchronous satellites that orbit above a fixed point on Earth, leaving out low-Earth orbit systems like Starlink, which require more sophisticated interception tools. Still, the findings raise a larger warning: while internet encryption has become nearly universal, space-based communications remain largely unprotected.

As one of the researchers summarized, “We’ve learned to lock down our data online — but when it comes to satellites, the door is still wide open.”