Is there a way to authenticate a radio on a conventional system like there is on trunking?
Not that the authentication couldn't be bypassed as we see on trunking systems but it would definitely cut down on the Chinese junk radios causing problems.
Regardless of the interference issues, the decision to lock down the comms is what the brass wants to do.
Yes there is, Motorola ASTRO Radio Authentication. Works all the way back to XTS/XTL line on both trunking and conventional P25 systems. The new COMIRS MA State Police System will be running it, in lieu of rolling out a bunch of ENC. Plans are only for a few additional talkgroups that will be AES 256. Generate auth key with a KVL Keyloader (just like ENC keys but not the same), auth key gets put in a database and you can set the system to only allow authenticated radios to transmit in. Unauthorized access can be taken care of without shutting people out of listening by passively scanning the system.
Like many, I'm ALL FOR encryption for many many things. I just dont think routine dispatch needs to be ENC. As a sworn LE Officer and a radio system administrator for my depts system + having subscribers on a statewide trunking system and dabbling in that a bit, I think it puts unnecessary barriers between the public and the police. Encryption blatantly states "you are the enemy" to grandma who has listened to her scanner on the kitchen table for 70 years. I'm in tune with all the "modern" issues. I get the streaming apps that are causing 98% of the pro ENC wave, etc but still dont agree with it. My ideal big city system would have plenty of ENC Channels/TGs and the threshold for using them/moving an "event"/protest whatever you want to call it over to a dedicated ENC would be quite low. Even remotely expecting trouble, sure go ahead and ENC. Dispatch would be partial ENC with a majority clear but dispatch and officers in field can use at their reasonable discretion. Hearing things like "the roads are starting to ice up", "theres an active incident on Sesame St", "there were a bunch of car breaks over there last night" is valuable info to the public which can be used to make decisions that presents no real advantage to bad actors if intercepted. In a natural disaster for example, you better believe that I think people have a right to be able to monitor their public safety providers as a means of real time, potentially life critical information. Twitter wont be working, newspapers wont be out, power out, the whole 9 yards. But a radio and a small reserve of batteries can take you quite far in the info game. Or not when you get people that want to encrypt Police, FIRE (how crazy), DPW, the dog catcher, the school bus, etc, etc. Its really gone too far in many places of the world.
I get all the "where does it stop" kind of arguments as well when the LTE only concept is brought into play. Or the "do you think you should be allowed to listen to the PDs phone calls?" arguments. It is an interesting debate however, I boil it down like this: public safety comms are generally "one to many" as opposed to "one to one" for a reason. Public Safety Business would be quite inefficient if handled by phone calls between only 2 people for example. The one to many concept needs to exist in operational comms and I for one believe that the public should be entitled to much of that traffic.
Dont get me started on the media issue. They are not trustworthy either, them getting it and public shut out is just as bad if not worse than nothing.