Bay Area Sports Blog » Chaussures Nike Shox A physical

The communication channel between the reader and Kobe VI the tag is wireless,while thatbetween the reader and the database can be either wired or wireless.Fig.6.1 shows a simpleRFID system in which the interface between the reader and the database is wired.The tagpresents its identification number or other stored information to the reader upon request.Thereader will then <a href="http://www.cheapnikeairmaxshoess.com/nike-air-max-90-c-10.html"><strong>nike air max 90</strong></a> communicate with the database.We assume that the communication betweenthe reader and the database is secure due to the use of some kind of standard encryptiontechnique. Kobe Basketball Shoes We further assume that an adversary can hear all transactions between a readerand a tag.In this paper we denote the database as S,the reader as R and the tag as T,although our solutions do not explicitly require a database.There are three main types of RFID tags,active tags,semi-active tags and passive tags.Anactive tag has its own battery to power the internal circuitry of the tag as well its transmissioncomponent.Semi-active tags are also features its own power source,but they only use thebatteries for powering the internal chip,not the communication. Chaussures Nike 2011 The passive tags have nointernal battery,but use the electromagnetic signal from the reader as a source of power.In43Figure 6.1 The RFID system model.this paper,we focus on passive tags,which are low-cost and resource-constrained.For example,the most popular passive tag,EPC Class 1 Gen 2,has at most 2000 hardware gates availablefor security features(3).6.2.2 Threat ModelRFID systems face with many threats launched by the attackers.The attackers can eitheractive or passive.The passive attackers mainly launch eavesdropping attacks to capture themessages transmitted between the reader and the tag.They intend toÂ* Chaussures Nike learn some secret orprivate information about the communicating parties.This information can then be usedfor the purpose of tracking or profiling,or finding secrets in other messages by utilizing bitmanipulation or other o?ine methods.The active attackers can jam wireless communication,send out bogus messages,or com-promise some tag.In this paper,we focus on physical attacks or replaying attacks launched bythe active <a href="http://www.cheapnikeairmaxshoess.com/nike-air-max-2010-c-44.html"><strong>nike air max 2010</strong></a> attackers. Chaussures Nike Shox A physical attack consists of probing the wires of the tag to learn the tagsecrets and model the tag's behavior.Copying all the information from one tag to another isalso a physical attack.A successful physical attack can give adversaries the ability to create######## tags,or impersonate a legitimate tag using some other device.In replaying attacks,theadversaries eavesdrop on the communication between the reader and the tag,and replay themessages at a later time. Chaussures Air Jordan The goal of a replay attack is either to attempt to impersonatesomeone,or to track an entity(usually a tag)for profiling purposes. 446.2.3 Problem DefinitionOne important functionality of RFID systems is tag search.Imagine a warehouse full <a href="http://zhiyou.mianbar.com.cn/space.php?uid=972634"><strong>Adidas Porsche Design As they come folded down - Social Networking</strong></a> oftagged items and a manager of the warehouse wants to know if a particular item is present inthe warehouse or not.The manager can use a reader to query the tag attached to that itemand listen for a correct response from the tag to detect the presence of the item.Based on thi######ample application,we define tag search problem as how a reader could determine among anumber of tags whether a particular one is present.Â*Â* Nike Air Yeezy Here,we call the tag being search for thetarget tag.