Researchers find ‘backdoor’ in encrypted police and military radios::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.
P25 only uses 56 bit encryption, there are better systems if you want to ensure that only the intended recipient will be able to receive your transmission. P25 is great for when you want to make sure that all your intended recipients can receive and intended senders can send, while minimizing undesired senders being received.
I probably could have done better with the wording on the link to a video contradicting what I’d said. It’s not meant to be taken seriously but that only really becomes obvious when you click through to find a video on how to make use of its flaws to disrupt traffic and listen in. Not everybody is going to do that though.