generate barcode c# free Detailed Device Analysis in C#.NET

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Detailed Device Analysis
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This section will discuss specific details of the most widely used wireless devices It is designed to provide solutions for specific problems and be a quick reference for wireless application designers needing information on specific devices
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Laptops
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Part 1 Introduction to Wireless
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Laptops are common wireless devices in corporate and Small Office Home Office (SOHO) wireless networks The low cost of wireless network gear has made wireless laptops a common appearance in the corporate enterprise and in home environments
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Physical security is a major problem with laptops One of the key decisionmaking factors when purchasing a laptop is size Generally, the smaller the laptop, the more it costs The smaller the laptop, the easier it is to steal, and thus the greater the loss to the company The loss of data encryption keys, such as Wired Equivalent Privacy (WEP) keys, soft tokens, remembered passwords, or private keys (such as Pretty Good Privacy [PGP] keys), is a large problem that needs to be considered when creating an application Once an attacker has obtained physical custody of a laptop, most security mechanisms can be circumvented The attacker can install his or her own software on the laptop Once the attacker controls the software, most software-based security mechanisms can be defeated The mobile nature of laptops also means that they are likely to connect to other networks that are not protected by the corporate firewall These may be Internet connections, customer networks, vendor networks, or other public networks such as hotels or trade shows where competitors may located The digital security of laptops in these environments needs to be considered
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One way to protect the physical security of laptops in a hostile environment is by using a security cable This is a cable that is designed to loop around a large object such as a table or desk and connect to a slot that most laptops have This does not guarantee that the laptop cannot be stolen, but it will slow down the thief and may cause him or her to look for easier targets Because laptops are frequently stolen, securing and backing up the data on the laptop is important Data encryption programs can be used to secure files or create encrypted volumes on hard drives to keep data secure These encrypted volumes normally require a private key protected by a password for decrypting the data Storing all the data in encrypted
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4 Security Considerations for Wireless Devices
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files or volumes has the added benefit of making backups of user data easy since the user knows the exact location of the sensitive files on the laptop Some e-mail programs also offer to store local mail in an encrypted format, although not all e-mail data store encryption is well implemented The storage of passwords and keys, such as WEP keys, on laptops should be considered Some wireless cards store WEP keys in the Windows registry in cleartext If you are relying on WEP for security (which is not recommended), you should consider choosing a card that does not store the WEP keys on the machine, but rather stores them in nonvolatile random access memory (NVRAM) on the Personal Computer Memory Card International Association (PCMCIA) card Also, if private keys are stored on the machine, such as PGP keys or host keys for Secure Shell (SSH), these should be password-protected and revoked as soon as a laptop is detected to be missing by the system administrator Users should be aware that laptops are common targets of theft and should avoid leaving their laptops in a place where they may be stolen Laptops are vulnerable in the office if left overnight In many cases, the office may be an uncontrolled environment accessible by many people, including other people from the company, cleaning staff, and visitors Make sure users know that laptops cost thousands of dollars and that they are often stolen Information leakage can also occur when laptop users are in a public environment Airplanes are a common place for business travelers to do work Other travelers on the plane could easily shoulder-surf the user and read sensitive information directly off the screen Laptops that will be operated in a hostile digital environment need to be protected Protecting a laptop is not substantially different than securing a server Unnecessary services should be disabled, which may lead to better performance A host-based intrusion detection system (HIDS) (discussed in 8) or personal firewall software should be part of a standard laptop configuration Remember that if you provide a wireless card for your users, they will likely use their computers in a hostile environment, such as an airport or coffee shop Many laptop users will also likely connect to the Internet unprotected via a dial-up or broadband connection Therefore, HIDS, personal firewall software, and antivirus software are recommended Whenever an attacker can install his or her own software on a laptop, he or she is likely to be able to bypass all security mechanisms Once the attacker has physical custody of the laptop or an opportunity to install software, it is very difficult to stop him or her Disabling boot up from a
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