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NYPD faces backlash as it prepares to encrypt radio communications | New York | The Guardian
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I find it fascinating how in the United States police radio communications aren't encrypted and therefore anyone can listen to them. In my European country all emergency service communications are TETRA encrypted.
Which had/has a built-in backdoor for years.
https://www.wired.com/story/tetra-radio-encryption-backdoor/