January 2007 - cypherpunks-legacy

walking like a bomber
by Eugen Leitl 22 Jan '07

22 Jan '07

http://www.techreview.com/printer_friendly_article.aspx?id=18072 Wednesday, January 17, 2007 Walking like a Bomber New strides in radar and gait-analysis software show that it's possible to detect when someone is carrying a bomb well before he or she reaches a security checkpoint. By Karen Nitkin In November 2005, three suicide bombers walked into three hotels in Jordan and blew themselves up, killing 63 and injuring more than 100. While the world is alert to such deadly threats, the challenge remains: how to detect approaching suicide bombers from a safe distance. X-ray machines can obviously see a concealed bomb, but they are dangerous to humans--and a bomber could detonate himself and kill people at the checkpoint. Video surveillance can help, but it requires personnel trained to scan crowds and pick out suspicious individuals. A new radar-imaging technology expected to reach market later this year could solve the problem by directing low-power radar beams at people--who can be 50 yards or more away--and analyzing reflected radar returns to reveal concealed objects. And early research indicates that this method could one day be augmented with video-analysis software that spots bombers by discerning subtle differences in gait that occur when people carry heavy objects. Virginia-based SET Corporation is developing both approaches for its CounterBomber, a system nearing commercialization that detects suicide-bomber suspects from a safe distance, says Thomas Burns, CEO of the company, which was founded four years ago by scientists from the Defense Advanced Research Projects Agency. Customers might include airports and military bases, he says. The device could be ready for sale by the fall of 2007. The first generation of the CounterBomber works by continuously steering a low-power radar beam toward the moving subject. The radar then repeatedly "interrogates" the subject. "The characteristics of the reflected radar beam are affected by weapons hidden beneath the clothing," Burns says. Signal processing software can detect those weapons or bombs without creating an under-the-clothes image that could violate the person's privacy, he says. And this technology is helped by novel technology that tracks the subject--thereby enabling the radar to be continuously aimed at the moving person. Software developed by Rama Chellappa, a professor in the department of electrical and computer engineering and a member of the University of Maryland's Institute for Advanced Computer Studies, uses a form of "gait recognition" to do this. It notes a person's walking style and physical attributes such as height, then uses those features to follow individuals as they move and locate them again even after they've been obscured by poles or other objects. "Rama's technology in its most basic form currently allows us to track the people more effectively, especially in crowds," Burns says. But the next generation of Chellappa's technology could extend the role of gait recognition. In early-stage research, he has shown that he can analyze the joint movements of a walking person and tell whether those movements are anomalous and possibly consistent with carrying heavy objects--and even whether the person has just deposited something on the ground. This work is at an early stage. Chellappa has created a model of human movement based on the movements of 11 joints--including the knee, elbow, and hip--and established a database of normal movements for a variety of body types traveling at a variety of speeds. This forms a database of the normal range of human movements, against which videos of a walking person can be compared. In a November demonstration at an army research conference in Orlando, FL, Chellappa showed that his system could detect someone who had just surreptitiously deposited an object on the ground simply by noting changes in the way the person walked before and after dropping the object. And he is now developing software able to detect the gait of people who have a 15-pound object attached to their legs. "We have clearly made a link between humans carrying things with them and the corresponding changes in their walking pattern," Chellappa says. "We see differences in the way people walk when they strap even 15 pounds to their ankle, but it's a very subtle thing." He concedes that the work is preliminary--and that the problem of detecting extra weight on a torso is a research challenge--but he adds, "I believe it's a reasonable way to approach it." His work represents a new direction for the field of human movement signatures, says Alex Vasilescu, a research scientist at MIT's Media Lab. Some gait-recognition research has shown the potential for early detection of diseases like Parkinson's. And several research groups are working on developing a way to take a person's "gait fingerprint." This could allow a video system to identify that person based on previously stored information. But Chellappa's technology requires no previous information about an individual. "It's very relevant to our times," Vasilescu says. "I would like to know if someone is carrying a concealed weapon, and we'll worry about who that person is afterwards." What's really novel in this research is that rather than searching for a gait fingerprint, the technology searches for suspicious activities, says Thomas McKenna, project manager at the Office of Naval Research, which funded Chellappa's work. "It's a new way of using surveillance that looks at activities, instead of looking for people," he says. The first version of the CounterBomber to reach market won't use gait recognition to determine whether someone is threatening. Rather, this first version uses only the reflected radar beam to make the determination. But the next version of the technology could include gait recognition as a way to help identify suspicious activity. "By incorporating Rama's full gait-recognition technology in the next generation of our system, we will be able to combine evidence both from the radar and the video sensors to improve our discrimination performance," Burns says. -- Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE [demime 1.01d removed an attachment of type application/pgp-signature which had a name of signature.asc]

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cracking DES in 2007 ? Followup question RE: digital cable
by Jason Arnaute 22 Jan '07

22 Jan '07

First question: How fast can I crack DES using a single processor, modern, commodity Pentium processor, circa 2007 ? Any comments on speeding it up using a GPU ? Can it be done in real time ? Are we talking four quad-cores CPUs or 40 quad-core CPUs (to do real time)? Second question: How relevant are the questions (and their answers) above to this: http://www.cablelabs.com/news/pr/1996/1996_10_03.html This is the standard used to encrypt digital television as they travel from the cable company to the customers set top box. From what I understand, the standard is NOT triple-DES, but just normal DES. Is there anything about what is being used here that would make it not related to, or not applicable to, the method and expense of cracking "DES" as discussed above? Any comments about any of this are appreciated. ____________________________________________________________________________________ Need a quick answer? Get one in minutes from people who know. Ask your question on www.Answers.yahoo.com

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Valentyne
by Proclus 21 Jan '07

21 Jan '07

The password is [cid:vqbqybekgk.gif] [demime 1.01d removed an attachment of type image/gif which had a name of vqbqybekgk.gif] [demime 1.01d removed an attachment of type application/octet-stream which had a name of Mychaell.zip]

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by Noah 21 Jan '07

21 Jan '07

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by Cassie Dumas 21 Jan '07

21 Jan '07

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by Timmy Paul 21 Jan '07

21 Jan '07

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by Susan Milligan 21 Jan '07

21 Jan '07

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20 Jan '07

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by (270) 818-7244 Cornelia 20 Jan '07

20 Jan '07

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