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The finding shows that bugs in software used to run tiny electronics components that are invisible to the average computer user can be extremely dangerous when hackers figure out how to exploit them. Security researchers have increasingly turned their attention to uncovering such flaws.

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Karsten Nohl, chief scientist with Berlin's SR Labs, noted that hackers could load malicious software onto tiny, low cost computer chips that control functions of USB devices but which have no built in shields against tampering with their code.

Christof Paar, a professor of electrical engineering at Germany's University of Bochum who reviewed the findings, said he believed the new research would prompt others to take a closer look at USB technology, and potentially lead to the discovery of more bugs. He urged manufacturers to improve protection of their chips to thwart attacks.

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An NSA spokeswoman declined to comment.

SR Labs tested the technique by infecting controller chips made by major Taiwanese manufacturer, Phison Electronics Corp , and placing them in USB memory drives and smartphones running Google Inc's Android operating system.

Nohl said he would not be surprised if intelligence agencies, like the National Security Agency, have already figured out how to launch attacks using this technique.

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Hackers can tap USB devices

Similar chips are made by Silicon Motion Technology Corp and Alcor Micro Corp. Nohl said his firm did not test devices with chips from those manufacturers.

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Nohl and Jakob Lell, a security researcher at SR Labs, will describe their attack method at next week's Black Hat hacking conference in Las Vegas, in a presentation titled: "Bad USB On Accessories that Turn Evil."

Last year, he presented research at Black Hat on breakthrough methods for remotely attacking SIM cards on mobile phones. spy agency was using a similar technique for surveillance, which it called "Monkey Calendar."

"Mr. Nohl did not offer detailed analysis together with work product to prove his finding," Chiu said. "Phison does not have ground to comment (on) his allegation."

"The sky is the limit. You can do anything at all," he said.

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"You cannot tell where the virus came from. It is almost like a magic trick," said Nohl, whose research firm is known for uncovering major flaws in mobile phone technology.

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Alex Chiu, an attorney with Phison, told Reuters via email that Nohl had contacted the company about his research in May.

Chiu said Converse Blue Shoes

Google did not respond to requests for comment. Officials with Silicon Motion and Alcor Micro could not immediately be reached.

"Now all of your USB devices are infected. It becomes self propagating and extremely persistent," Nohl said. "You can never remove it."

Nohl believed hackers would have a "high chance" of corrupting other kinds of controller Baby Converse High Tops Red

Thousands of security professionals gather at the annual conference to hear about the latest hacking techniques, including ones that threaten the security of business computers, consumer electronics and critical infrastructure.

In his tests, Nohl said he was able to gain remote access to a computer by having the USB instruct the computer to download a malicious program with instructions that the PC believed were coming from a keyboard. He was also able to change what are known as DNS network settings on a computer, essentially instructing the machine to route Internet traffic through malicious servers.

that "from Phison's reasonable knowledge and belief, it is hardly possible to rewrite Phison's controller firmware without accessing our confidential information."

chips besides those made by Phison, because their manufacturers are not required to secure software. He said those chips, once infected, could be used to infect mice, keyboards and other devices that connect via USB.

BOSTON USB devices such as keyboards, thumb drives and mice can be used to hack into personal computers in Converse Shoes White Colour a potential new class of attacks that evade all known security protections, a top computer researcher revealed on Thursday.

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Nohl said his firm has performed attacks by writing malicious code onto USB control chips used in thumb drives and smartphones. Once the USB device is attached to a computer, the malicious software can log keystrokes, spy on communications and destroy data, he said.

Computers do not detect the Converse Trainers Sale

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infections when tainted devices are inserted because anti virus programs are only designed to scan for software written onto memory and do not scan the "firmware" that controls the functioning of those devices, he said.

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Once a computer is infected, it could be programmed to infect all USB devices that are subsequently attached to it, which would then corrupt machines that they contact.

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