Understand Wireless Security LESSON 1.4 98-367 Security Fundamentals.

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Presentation transcript:

Understand Wireless Security LESSON Security Fundamentals

LESSON 1.4 Lesson Overview How do you secure a wireless network? In this lesson, you will learn:  Concepts related to securing a wireless network  Problems that can arise without security

Security Fundamentals LESSON 1.4 Anticipatory Set  Open the Network Places on your computer and record the properties of each connection.

Security Fundamentals LESSON 1.4 Guiding Questions 1. What is the status of each connection? 2. Is the Windows ® firewall turned on? Off? 3. What processes run during a “repair”?

Security Fundamentals LESSON 1.4 Wireless Technologies Wired Equivalent Privacy (WEP)  The WEP encryption standard has been compromised and is considered unsafe.  WEP is an encryption algorithm system included as part of the standard, developed by the Institute of Electrical and Electronics Engineers as a security measure to protect wireless LANs from casual eavesdropping. WEP uses a shared secret key to encrypt packets before transmission between wireless LAN devices and monitors packets in transit to detect attempts at modification. WEP offers both 40-bit and 128-bit hardware-based encryption options.

Security Fundamentals LESSON 1.4 Wireless Technologies – WiFi  The technology is designed to work with existing Wi-Fi products that have been enabled with WEP (i.e., as a software upgrade to existing hardware), but the technology includes two improvements over WEP:software  Improved data encryption through the temporal key integrity protocol (TKIP). TKIP scrambles the keys using a hashing algorithm and, by adding an integrity-checking feature, ensures that the keys haven’t been tampered with.  User authentication, which is generally missing in WEP, through the extensible authentication protocol (EAP). WEP regulates access to a wireless network based on a computer’s hardware-specific MAC address, which is relatively simple to be sniffed out and stolen. EAP is built on a more secure public key encryption system to ensure that only authorized network users can access the network.

Security Fundamentals LESSON 1.4 Wireless Technologies Service Set Identifier (SSID)  A 32-character unique identifier attached to the header of packets sent over a WLAN that acts as a password when a mobile device tries to connect to the BSS (the communicating stations, or nodes, on a wireless LAN).  The SSID differentiates one WLAN from another, so all access points and all devices attempting to connect to a specific WLAN must use the same SSID. A device will not be permitted to join the BSS unless it can provide the unique SSID.  Because an SSID can be sniffed in plain text from a packet it does not supply any security to the network. An SSID is also referred to as a network name because essentially it is a name that identifies a wireless network.

Security Fundamentals LESSON 1.4 Class Activity Can you find and identify a rogue (unauthorized) Wi-Fi access point? What tools would you use? Recommend?

Security Fundamentals LESSON 1.4 Lesson Review  Who can change the level of encryption on a wireless access point?  What is the highest level of wireless security?  What is the advantage of changing the SSID?