WASHINGTON - Police departments around the U.S. are working to shield their radio communications from the public as cheap, user-friendly technology has made it easy for anyone to use handheld devices to keep tabs on officers responding to crimes.
The practice of encryption has grown more common from Florida to New York and west to California, with law-enforcement officials saying they want to keep criminals from using officers' internal chatter to evade them. But journalists and neighborhood watchdogs say open communications ensure that the public receives information that can be vital to their safety as quickly as possible.
D.C. police moved to join the trend this fall after what Chief Cathy Lanier said were several incidents involving criminals and smartphones. Carjackers operating on Capitol Hill were believed to have been listening to emergency communications because they were only captured once police stopped broadcasting over the radio, she said.
"Whereas listeners used to be tied to stationary scanners, new technology has allowed people -- and especially criminals -- to listen to police communications on a smartphone from anywhere," Lanier testified at a D.C. Council committee hearing this month. "When a potential criminal can evade capture and learn, 'There's an app for that,' it's time to change our practices."
The transition has put police departments at odds with the news media, who say their newsgathering is impeded when they can't use scanners to monitor developing crimes and disasters. Journalists and scanner hobbyists argue that police departments already have the capability to communicate securely and should be able to adjust to the times without reverting to full encryption. And they say alert scanner listeners have even helped police solve crimes.
"If the police need to share sensitive information among themselves, they know how to do it," Phil Metlin, news director of WTTG-TV, in Washington, said at the council hearing. "Special encrypted channels have been around for a long time; so have cellphones."
It's impossible to quantify the scope of the problem or to determine if the threat from scanners is as legitimate as police maintain -- or merely a speculative fear. It's certainly not a new concern -- after all, hobbyists have for years used scanners to track the activities of their local police department from their kitchen tables.
David Schoenberger, a stay-at-home dad from Fredericksburg, Va., and scanner hobbyist, said he understands Lanier's concerns -- to a point.
"I think they do need to encrypt the sensitive talk groups, like the vice and narcotics, but I disagree strongly with encrypting the routine dispatch and patrol talk groups. I don't think that's right," he said. "I think the public has a right to monitor them and find out what's going on around them. They pay the salaries and everything."
There's no doubt that it's increasingly easy to listen in on police radios.
One iPhone app, Scanner 911, offers on its website the chance to "listen in while police, fire and EMS crews work day & night." Apple's iTunes' store advertises several similar apps.
Though iPhones don't directly pick up police signals, users can listen to nearly real-time audio from police dispatch channels through streaming services, said Matthew Blaze, director of the Distributed Systems Laboratory at the University of Pennsylvania and a researcher of security and privacy in computing and communications systems.
The shift to encryption has occurred as departments replace old-fashioned analog radios with digital equipment that sends the voice signal over the air as a stream of bits and then reconstructs it into high-quality audio. Encrypted communication is generally only heard by listeners with an encryption key. Others might hear silence or garbled talk, depending on the receiver's technology.
The cost of encryption varies.
The Nassau County, N.Y., Police Department is in the final stages of a roughly $50 million emergency communications upgrade that includes encryption and interoperability with other law-enforcement agencies in the region, Inspector Edmund Horace said. Once the old system is taken down, Horace said, "you would not be able to discern what's being said on the air unless you had the proper equipment."
Still, full encryption is cumbersome, difficult to manage and relatively rare, especially among big-city police departments who'd naturally have a harder time keeping track of who has access to the encryption key, Blaze said.
The more individuals or neighboring police agencies with access, the greater the risk that the secrecy of the system could be compromised and the harder it becomes to ensure that everyone who needs access has it, Blaze said.
Relatively few local police departments are actually encrypted, Blaze said, though some cities have modern radio systems for dispatch that are difficult to monitor on inexpensive equipment.
However, the systems can be intercepted with higher-end scanners.
by Eric Tucker Associated Press Nov. 24, 2011 12:00 AM
Police try to shield radio communication
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