Part 1 Introduction to Wireless in Visual C#

Decode UPC-A Supplement 2 in Visual C# Part 1 Introduction to Wireless

Part 1 Introduction to Wireless
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Access point network backdoor
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A similar configuration can also bridge air-gap networks via a wireless channel and funnel data from an air-gapped network outside a protective building by chaining access points together until the final leg of the link leaves the confines of the building as shown in Figure 2-11 This configuration can effectively increase the amount of coverage area to many miles The equipment needed for this configuration is very inexpensive and may be purchased at most electronic stores
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Roaming Issues
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Another major difference between a wireless and a wired environment is end-point mobility The concept of roaming on Code-Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), and wireless Ethernet are all very similar Many Transmission Control Protocol/Internet Protocol (TCP/IP) network applications require the IP address of the server and the client to remain static; however, when roaming among a network, you will undoubtedly be required to leave and join across subnets This requirement is the drive behind mobile IP and other wireless network roaming mechanisms
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2 Wireless Threats
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Figure 2-11 Attacker extending range by chaining access points
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Protected Network
Network Resource
Attacker Attacker's Access Attacker's Access Point Point
Network Resource
The basic idea behind mobile IP is location registration and packet redirection A location-independent address is used to keep TCP/IP connectivity alive, while a temporary location-dependent address is used to provide connectivity to the local network resources There are three other mandatory requirements of a mobile IP system There is the mobile node (MN), home agent (HA), and the foreign agent (FA) The MN is the wireless user device, the HA is a server located on the MN s home network, and the FA is a server residing on the roamed-to network When an MN roams to a network, it obtains a temporary location-dependent IP address and registers with a FA The FA then communicates with the HA, notifying the HA that the MN is attached to it, and that all packets should now be routed through the roamed-to FA to be delivered to the MN There are some obvious problems with this schema Replay attacks of the registration process can be performed by a rogue station in a different cell to attempt to capture outbound traffic from the network One can also imitate a valid station and illegitimately obtain network service
Part 1 Introduction to Wireless
Cryptographic Threats
CDMA and GSM cellular networks and wireless Ethernet networks have employed cryptographic mechanisms in order to deter eavesdropping and stymie unauthorized network usage However, in both networks, oversights resulted in the compromise of communications and fraudulent use Wired Equivalent Privacy (WEP) is a cryptographic mechanism designed to provide security for 80211 networks Implementation flaws and key management issues have proved WEP almost useless WEP was designed with a single static key that was to be used by all users Controlling access to these keys, changing the keys frequently, and detecting compromises is nearly impossible An examination of the implementation of the RC4 algorithm in WEP has revealed weaknesses that enable an attacker to completely recover the key after capturing minimal network traffic Tools are available on the Internet that allow an attacker to recover the key in a number of hours Therefore, WEP cannot be relied on to provide authentication and confidentiality on a wireless network Using these cryptographic mechanisms is better than not using them, but due to the known vulnerabilities, other mechanisms are needed to protect against the aforementioned attacks All wireless communication networks are subject to the attacker eavesdropping on phases of contact, namely, connection establishment, session communication, and connection termination The very nature of wireless communication eliminates out-of-band management and control, thus requiring protection Key management, as always, presents additional challenges when being applied to roaming users and a shared open medium We will discuss commonly used cryptographic mechanisms in the following chapter
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