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Obviously he doesnt care about stealing the code which should be for everyone. You are using an out of date browser. Police, fire, ambu is mostly crypted, but enoug clear signals to receive. A P25 system that is encrypted could attract the attention of hackers and anarchists who would want to use jamming . Im set with 16 bit dvd sound on both input outputs, volumes are according, its definitely P25 voice decoding as its showing voice. This concludes our introduction to P25. TG = 39 Ch =4, I have a voice with cuts with one word out of two on the left and nothing on the right channel. An audio sample from a weak P25 sample can be found here for DSD+, and for comparison here for the old DSD. Ensure you are using a good antenna and have set the RTL-SDR gain correctly. Unfortunatelyfor radio scanner hobbyists, digital radio is difficult to receive, as special radio scanners which can be expensive are required to decode the digital signal. One-to-one Microsoft Teams video calls can now be end-to-end encrypted. unknown/infalid DUID: 2 (sometimes that 2 is an 8 or a 14). Hi, check the windows sound screen (by right clicking the speaker icon and going to playback devices) verify that the volume meter for VAC is showing sound output. I would imagine, as least theorethically, the encrypted voice from these can be recovered through trial and error, and massive computing power maybe ? Thanks. Each radio that uses that group has a key that is loaded into it. RTL-SDR Tutorial: Decoding Digital Voice (P25, DMR, NXDN, D-STAR) with DSD I only included that part as a just in case type of thing. Fox-ITSecurity researchers have devised a method of defeating AES-256bit encryption in as little as five minutes, and most importantly, you dont need an expensive supercomputer to do it. That was technically only possible because of ideal testing conditions though. I know I have VAC installed correctly, am tuned to a known P25 frequency with a strong signal, but its almost like VAC doesnt hear anything so no scrolling or decoding happens. I think I am going to give up though. Although breaking open someones obfuscated files is almost always going to be easier if you extract the decryption key from the owner, this system offers a new way for all sorts of organizations and individuals to target it. "Encrypt Call Parameters" is another one that is used a lot to mask the underlying details. Archived post. Problem is I can hear anything because the output is set to the VCable and in play back options in windows VCable is set as the default device. P25 is a digital voice mode which means if you listen to the data stream on an analogue radio it sounds like hash. Modern public safety radios are digital, so the signal path is more like: voice -->a/d converter -->AES encryption -->frequency modulation of data (transmitter) -->demodulation of data (receiver) -->AES decryption . Thought I would share a article on decoding p25 encryption Security Researchers Crack APCO P25 Encryption - Slashdot . P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide.