The TETRA standard is used in radios worldwide. Security researchers have found multiple vulnerabilities in the underlying cryptography and its implementation, including issues that allow for the decryption of traffic.
If I had to guess, they’re using frequency hopping across your frequencies. Afaik, many emergency and LE services use a combination of encrypted and unencrypted radio comms, so you’re probably only hearing the unencrypted comms as they hop into your frequency.
I doubt it’s related to the backdoor references in the article. But it’s been a while since I played around with RF and even when I did, I wasn’t really an expert despite it being in the job description.
If I had to guess, they’re using frequency hopping across your frequencies. Afaik, many emergency and LE services use a combination of encrypted and unencrypted radio comms, so you’re probably only hearing the unencrypted comms as they hop into your frequency.
I doubt it’s related to the backdoor references in the article. But it’s been a while since I played around with RF and even when I did, I wasn’t really an expert despite it being in the job description.