Well, if the standard have really have only 32 000 combinations, its absolutely possible? or i may be wrong about that?It can be decrypted if you have the key. But otherwise trying to guess is going to be impossible. There isn't a "universal" key that will let you listen to everything, and no legal/consumer grade gear that will decrypt automatically.
The Icom R30 will decode this...with a known key. In theory it could be brute forced. It may take 32,767 attempts though.
I think you'd need some form of baseband modulator to take the raw [encrypted] audio recording and replay it/module to an rf signal to try and decode via your R8600 receiver. I have no idea how you might actually go about doing this in practice (but I'm interested to learn if some clever person out there can help).For example, I have a recorded transmission in dPMR format, encrypted, is there any software/device through which I can decrypt it or even manually guess the 32,767 possible keys? i think, i cannot do it via R-8600, R-8600 needs a real transmition?