A $50 device made with off the shelf hardware can.

For $50 attackers can build a radio device that cracks home alarm systems and other common security devices, Black Hat 2014 attendees will hear this week.

A combination of a microcontroller and a single-board computer comprises the device, which can capture and replay codes that make it possible to disable the alarms, according to Silvio Cesare, a researcher at Qualys who will present the talk.

+ Also on Network World: 10 disturbing attacks at Black Hat USA 2014 |The Black Hat Quiz 2014 +

He says he built the device and was able to train it to steal the codes by eavesdropping on the radio-frequency remote that most alarm systems come with to enable and disable the gear. He says that practically all home alarm systems that had a remote used fixed codes, making a replay attack possible once the code was pilfered.

The device was made from Arduino and Raspberry Pi hardware.

Another soft spot he discovered in home alarm systems is the non-volatile memory that stores information such as calibration, configuration and passwords. With physical access to the devices he says he can connect a device programmer that reads the device's minicontroller where the passcode is stored that customers punch in to enable or disable the alarms.

Either method would let burglars shut down security systems so they could break in without fear of sounding the alarm.

Surprisingly, he says, the easiest way to defend against these types of attacks is to buy systems that don't have these vulnerabilities. He says he'll lay down how to shop for alarm systems that pass the test.

Cesare also plans to show how to break security of the keyless entry system of a popular late-model car using predictable rolling codes. To analyze the system he used software defined radio and some math, but he also built a button-pushing robot to punch in combinations of numbers in order to gather data to do the math.

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Black Hat 2014: How to steal security codes from home alarm systems

Wafer takes stand in Renisha McBride fatal shooting case Wafer takes stand in Renisha McBride fatal shooting case

Updated: Monday, August 4 2014 4:11 PM EDT2014-08-04 20:11:02 GMT

DETROIT (AP) -- A Detroit-area man on trial for killing an unarmed woman who showed up drunk on his porch told jurors Monday that when he bought the gun he shot her with, it was a form of home security he could afford.Theodore Wafer took the witness stand on the seventh day of testimony in his trial on second-degree murder charges in the Nov. 2 slaying of Renisha McBride.Wafer's lawyer, Cheryl Carpenter, asked if he had a security system installed at his home. He said no. "I think everybody w...

DETROIT (AP) -- A Detroit-area man on trial for killing an unarmed woman who showed up drunk on his porch told jurors Monday that when he bought the gun he shot her with, it was a form of home security he could afford.Theodore Wafer took the witness stand on the seventh day of testimony in his trial on second-degree murder charges in the Nov. 2 slaying of Renisha McBride.Wafer's lawyer, Cheryl Carpenter, asked if he had a security system installed at his home. He said no. "I think everybody w...

Updated: Thursday, July 31 2014 7:47 PM EDT2014-07-31 23:47:47 GMT

DETROIT (AP) -- A former medical examiner sparred with a prosecutor Thursday over a wound on the hand of a woman who was fatally shot on a Detroit-area porch, telling jurors it seems to fit the defense's claim that Renisha McBride was pounding on the homeowner's doors before she was killed.Dr. Werner Spitz, a forensic pathologist, said photos of McBride's body show a "small superficial laceration" on her left hand. It "could have come from pounding on something," Spitz said.The testimony was ...

DETROIT (AP) -- A former medical examiner sparred with a prosecutor Thursday over a wound on the hand of a woman who was fatally shot on a Detroit-area porch, telling jurors it seems to fit the defense's claim that Renisha McBride was pounding on the homeowner's doors before she was killed.Dr. Werner Spitz, a forensic pathologist, said photos of McBride's body show a "small superficial laceration" on her left hand. It "could have come from pounding on something," Spitz said.The testimony was ...

Updated: Wednesday, July 30 2014 5:46 PM EDT2014-07-30 21:46:50 GMT

The prosecution has rested its case in the Renisha McBride murder trial. Theodore Wafer, 55, has been charged with second-degree murder, manslaughter and felony firearm.

The prosecution has rested its case in the Renisha McBride murder trial. Theodore Wafer, 55, has been charged with second-degree murder, manslaughter and felony firearm.

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Wafer takes stand in Renisha McBride fatal shooting case

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Residents and businesses in Champaign County with home security video systems are being encouraged to register with the Champaign County Sheriffs Office.

A new crime-fighting program called Sheriff and Citizens Expanding Neighborhood Eyes, or SCENE, allows people to register their systems and assist the office in investigating local crimes.

Those who have video systems for security or wildlife are asked to register. If a crime happens near your home, a deputy will email you and ask you to check your recordings for the date and time of the crime, to see if the a suspect or car can be seen.

This might be the one piece of evidence that we need to help solve burglaries or B&Es (breaking and entering) in the area, said Capt. David Rapp, Champaign County Sheriffs Office.

Shelly Thurman knows what it feels like to have ones home burglarized.

Its a terrifying thing. I had a hard time sleeping there for a while, she said. My front door was kicked in once. They pulled my safe out. They busted stuff up.

Now, Thurman is being extra vigilant watching for crime in her neighborhood.

I want to see whats going on. I want to keep an eye out on my neighbors, she said.

Registration for the SCENE program is available on the countys website, http://www.ChampaignOhioSheriff.com.

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Champaign County residents encouraged to join surveillance effort