Geostationary satellites are broadcasting large volumes of unencrypted data to Earth, including private voice calls and text messages as well as consumer internet traffic, researchers have discovered.

Scientists at the University of California, San Diego, and the University of Maryland, College Park, say they were able to pick up large amounts of sensitive traffic largely by just pointing a commercial off-the-shelf satellite dish at the sky from the roof of a university building in San Diego.

In its paper, Don't Look Up: There Are Sensitive Internal Links in the Clear on GEO Satellites [PDF], the team describes how it performed a broad scan of IP traffic on 39 GEO satellites across 25 distinct longitudes and found that half of the signals they picked up contained cleartext IP traffic.

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