Security in Fixed and Wireless Networks: An Introduction to Securing Data Communications

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WLAN security: Best practices for wireless network security

Although that certainly has serious consequences, a rogue wireless access point WAP provides an even bigger concern because it may allow somebody from outside the facility to gain access to the network just as though they walked in and plugged in a laptop to a wall jack. Fortunately, detecting a rogue WAP can be done in a fairly straightforward manner. In order to do this you must first start by capturing wireless traffic from several areas within your networks broadcast range.

Once this is done there are several different filters that can be used to determine if rogue access points exist and if clients are associating with them. Using this information, you can input the filter! This will show you all wireless traffic that is going to or from a WAP other than the one specified. In that case, you could use something like! That method should work for finding access points in general, but what if you wanted to go one step farther and find out if your mobile workstations are actually connecting to the rogue WAP?

One way to do that would be to filter for association requests. In order to do that you can combine one of the previous filters with the filters wlac.

What is Wireless Network? - Definition from Techopedia

The first filter will show all association requests and the second will show re-association requests. Lastly, you can go one step further by determining if there is any actually data being transferred between mobile clients and a rogue WAP. You can do this by filtering on all data packets that are being communicated with a non legitimate access point by using the filter wlan. The only real hope you have in defending packets from eavesdroppers as they fly through the air is to employ some type of encryption. That being said, it's good security practice to audit your wireless networks every so often and ensure that there are no wireless clients transmitting data in an unencrypted method.

This can happen easier than you think as a WAP could be misconfigured, a rogue WAP could be present, or two wireless clients could be communicating directly in ad-hoc mode. Finding unencrypted data on the wireless network is a matter of using another filter. In this case we can find all packets with unencrypted data by using the wlan.

Now, if you use this right now you will find that it returns some unexpected results. That being the case we must extend this filter by appending wlan. This will ensure that the filter only displays data packets that are unencrypted. The final filter would be wlan. WEP was mildly successful for years until several weaknesses were uncovered in its encryption key management. Along with that, you should be able to analyze failed authentication attempts when they are present. This challenge is acknowledged and then the client takes the text, decrypts it with the WEP key provided by the client, and transmits the resultant string back to the WAP.

Once the WAP verifies that the response text is what it should be, it transmits a message back to the client to notify it that the authentication process was successful. Figure 2: The WAP alerts the client that authentication was a success. This paper will present the issues surrounding newly discovered vulnerabilities with WEP, as well as current access control problems that exist with the wireless architecture currently in use.

It will also propose methods that can be used to help secure wireless LANs. This document is written as Introduction to the Wireless Application Protocol and as a high level view of where the industry is headed in respect to this particular protocol. Mobile communications technology is changing and presents new challenges to information security. With the creation of HIPAA, many health care providers are revising their business models to include a wireless platform in hopes that it will transcend them into the next generation of health care, but not without addressing serious security concerns.

Wireless Technology - Wired Equivalent Privacy Protocol

A discussion of wireless computing technology and tips for making it more secure. This paper will provide some background on wireless technology, look at wireless network security issues, then review recent news, and finally offer some suggestions for discouraging the hackers from playing in your wireless backyard. Fundamental security concerns surrounding WLANs are addressed by examining OSI layers one physical and two media access control of the The author explores the theory that having a device that connects to a Personal Area Network may in fact not be so personal.

Network security is dynamic - what did work today might not tomorrow; WLAN security requires constant attention to changing needs. Most of the computer security white papers in the Reading Room have been written by students seeking GIAC certification to fulfill part of their certification requirements and are provided by SANS as a resource to benefit the security community at large.

SANS attempts to ensure the accuracy of information, but papers are published "as is". Errors or inconsistencies may exist or may be introduced over time as material becomes dated. If you suspect a serious error, please contact webmaster sans. All papers are copyrighted. No re-posting or distribution of papers is permitted. There are no shortcuts to anywhere worth going! We'l [ I thoroughly recommend it.

Transport Layer and Security Protocols for Ad Hoc Wireless Networks

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Wireless Access Featuring 70 Papers as of October 19, Wireless Networks and the Windows Registry - Just where has your computer been? Consideraciones para la implementacion de An Overview of Enterprise The evolution of wireless security in Scouts Out! Bluetooth: The Global Technology? Perils and Fixes for Penetration Testing on The Limits on Wireless Security: Wireless LANs and Wireless Application Protocol 2.


Wireless Networking: Compromising Security for Convenience? IEEE Policy and procedure must cover management and monitoring of the WLAN, including topics such as training, acceptable use, encryption, passwords, identity, client device security and privacy.


Agencies must have policies that clearly state which forms of connections are permitted or prohibited for their WLAN client devices under various circumstances. Agencies must enforce these policies through the appropriate security controls. These guidelines must provide a complete inventory of all wireless system components such as access points, wireless switches, client devices and any other equipment within your WLAN. The inventory must be updated on a periodic basis, at a minimum annually, to account for device changes.


Agencies must have standardized security configurations for their common WLAN components, such as client devices and APs to ensure a standard level of security is implemented while reducing vulnerabilities and lessening the impact of successful attacks. These configurations must be deployed to the appropriate devices, and maintained throughout their lifecycle. If implemented correctly standardized configurations can significantly reduce the time and effort needed to detect and correct unauthorized changes to configurations, and to react quickly when newly identified vulnerabilities arise. Therefore, agencies must ensure that adequate physical security is in place to restrict access to WLAN components, which includes access points, servers, routers, switches and firewalls.

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Locked means an area that has a lock with controlled access to the keys or combinations. Secured interior area refers to internal areas that have been designed to prevent undetected entry by unauthorized persons during duty and non-duty hours. This includes access points, client devices, switches and firewalls. Client device security controls include using personal firewalls, host-based intrusion detection and prevention systems and antivirus software on client devices; disabling IEEE Client devices must also be kept current with patches and updates. There are two types of wireless access points called thick intelligent and thin.

Thick APs handle authentication and encryption as well as overall management of the network clients, whereas thin APs have limited intelligence and are managed by a centralized WLAN controller. Thin APs are generally more secure than thick APs because thin APs do not have a key that could be extracted and do not require the same level of physical security and other countermeasures than thick APs. A hub is a device that physically connects all stations on a local subnet to one circuit, but maintains no knowledge of what devices are connected to its ports. Ethernet hubs broadcast network traffic to all physical interfaces and connected devices, which leaves the broadcasted traffic vulnerable to unauthorized monitoring. The use of the Ethernet hub infrastructure increases the risk that the AP may be broadcasting FTI that was transmitted through the hub.