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机械设计与应用

超星学习通网课答案_机械设计与应用_答案章节作业期末答案

时间:2020-07-10 20:03:06 作者:2020年超星学习通郭佳锋测试通知中心-副本-副本答案 浏览量:29031

题目:机械设计与应用

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Directions: You are going to read a passage with 10 statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. Each paragraph is marked with a letter.Can Burglars Jam Your Wireless Security System?A Any product that promises to protect your home deserves careful examination. So it isnt surprising that youll find plenty of strong opinions about the potential vulnerabilities of popular home-security systems.B The most likely type of burglary(入室盗窃)by far is the unsophisticated crime of opportunity, usually involving a broken window or some forced entry. According to the FBI, crimes like these accounted for roughly two-thirds of all household burglaries in the US in 2013. The wide majority of the rest were illegal, unforced entries that resulted from something like a window being left open. The odds of a criminal using technical means to bypass a security system are so small that the FBI doesnt even track those statistics.C In recent years, there has been no shortage of reports on television about researchers who say they have found teens addicted to their mobile phones. Perhaps a better way to view the data is an illustration of how mobile phones in general, and texting in particular, have taken over the experiential world of the young. An economist might expect that teens deprived of texting would simply substitute another method of communication-talking, for instance. As it turns out, a significant minority will not. They will behave instead, researchers report, the way people do when deprived of human contact.D Jamming concerns are nothing new, and theyre not unique to security systems. Any device thats built to receive a wireless signal at a specific frequency can be overwhelmed by a stronger signal coming in on the same frequency. For comparison, lets say you wanted to jam a conversation between two people—all youd need to do is yell in the listeners ear.E Security devices are required to list the frequencies they broadcast on—that means that a potential thief can find what they need to know with minimal Googling. They will, however, need to know what system theyre looking for. If you have a sign in your yard declaring what setup you use, thatd point them in the right direction, though at that point, were talking about a highly targeted, semi-sophisticated attack, and not the sort of forced-entry attack that makes up the majority of burglaries. Its easier to find and acquire jamming equipment for some frequencies than it is for others..F Wireless security providers will often take steps to help combat the threat of jamming attacks. SimpliSafe, winner of our Editors Choice distinction, utilizes a special system thats capable of separating incidental RF interference from targeted jamming attacks. When the system thinks its being jammed, itll notify you via push alert(推送警报). From there, its up to you to sound the alarm manually.G SimpliSafe was singled out in one recent article on jamming, complete with a video showing the entire system being effectively bypassed with handheld jamming equipment. After taking appropriate measures to contain the RF interference to our test lab, we tested the attack out for ourselves, and were able to verify that its possible with the right equipment. However, we also verified that SimpliSafes anti-jamming system works. It caught us in the act, sent an alert to my smartphone, and also listed our RF interference on the systems event log. The team behind the article and video in question make no mention of the system, or whether or not it detected them.H We like the unique nature of that software. It means that a thief likely wouldnt be able to Google how the system works, then figure out a way around it. Even if they could, SimpliSafe claims that its system is always evolving, and that it varies slightly from system to system, which means there wouldnt be a universal magic formula for cracking it. Other systems also seem confident on the subject of jamming. The team at Frontpoint addresses the issue in a blog on its site, citing their own jam protection software and claiming that there arent any documented cases of a successful jam attack since the company began offering wireless security sensors in the 1980s.I Jamming attacks are absolutely possible. As said before, with the right equipment and the right know-how, its possible to jam any wireless transmission. But how probable is it that someone will successfully jam their way into your home and steal your stuff?Texting crowds out other activitiesJ Lets imagine that you live in a small home with a wireless security setup that offers a functional antijamming system. First, a thief is going to need to target your home, specifically. Then, hes going to need to know the technical details of your system and acquire the specific equipment necessary for jamming your specific setup. Presumably, you keep your doors locked at night and while youre away, so the thief will still need to break in. That means defeating the lock somehow, or breaking a window. Hell need to be jamming you at this point, as a broken window or opened door would normally release the alarm. So, too, would the motion detectors in your home, so the thief will need to continue jamming once hes inside and searching for things to steal. However, hell need to do so without tripping the anti-jamming system, the details of which he almost certainly does not have access to.K At the end of the day, these kinds of systems are primarily designed to protect against the sort of opportunistic smash-and-grab attack that makes up the majority of burglaries. Theyre also only a single layer in what should ideally be a many-sided approach to securing your home, one that includes common sense things like sound locks and proper exterior lighting at night. No system is impenetrable, and none can promise to eliminate the worst case completely. Every one of them has vulnerabilities that a knowledgeable thief could theoretically exploit. A good system is one that keeps that worst-case setting as improbable as possible while also offering strong protection in the event of a less-extraordinary attack.1. It is possible for burglars to make jamming attacks with the necessary equipment and skill.2. Interfering with a wireless security system is similar to interfering with a conversation.3. A burglar has to continuously jam the wireless security device to avoid triggering the alarm, both inside and outside the house.4. SimpliSafe provides devices that are able to distinguish incidental radio interference from targeted jamming attacks.5. Only a very small proportion of burglaries are committed by technical means.6. It is difficult to crack SimpliSafe as its system keeps changing.7. Wireless devices will transmit signals so as to activate the alarm once something wrong is detected.8. Different measures should be taken to protect ones home from burglary in addition to the wireless security system.9. SimpliSafes device can send a warning to the house owners cellphone.10. Burglars can easily get a security devices frequency by Internet search.

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