Two Chinese scientists have come up with a method of decrypting satellite phone communications. Their method works against GMR-2, the latest version of the GEO-Mobile Radio Interface that is used to support communications from a satellite phone to overhead satellites. The new attack could help with the creation of encryption-busting equipment that intercepts and breaks satellite phones. The Chinese researchers reverse engineered the entire process of how the phone chooses an encryption key to secure its communications in real-time using the data sent from the phone.
Source: https://www.bleepingcomputer.com/news/security/researchers-find-a-way-to-crack-satellite-phone-communications-in-real-time/