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Wireless networks are accessible to anyone within the router’s transmission radius. This makes them vulnerable to attacks. Hotspots are available in public places such as airports, restaurants, parks, etc.

In this tutorial, we will introduce you to common techniques used to exploit weaknesses in wireless network security implementations. We will also look at some of the countermeasures you can put in place to protect against such attacks. Topics covered in this tutorial • • • • • • What is a wireless network? A wireless network is a network that uses radio waves to link computers and other devices together. The implementation is done at the Layer 1 (physical layer) of the OSI model. How to access a wireless network?

You will need a wireless network enabled device such as a laptop, tablet, smartphones, etc. You will also need to be within the transmission radius of a wireless network access point.

Most devices (if the wireless network option is turned on) will provide you with a list of available networks. If the network is not password protected, then you just have to click on connect. If it is password protected, then you will need the password to gain access. Wireless Network Authentication Since the network is easily accessible to everyone with a wireless network enabled device, most networks are password protected.

Let’s look at some of the most commonly used authentication techniques. WEP WEP is the acronym for Wired Equivalent Privacy. It was developed for IEEE 802.11 WLAN standards. Its goal was to provide the privacy equivalent to that provided by wired networks.

WEP works by encrypting the data been transmitted over the network to keep it safe from eavesdropping. WEP Authentication Open System Authentication (OSA) – this methods grants access to station authentication requested based on the configured access policy. Shared Key Authentication (SKA) – This method sends to an encrypted challenge to the station requesting access.

The station encrypts the challenge with its key then responds. If the encrypted challenge matches the AP value, then access is granted.

WEP Weakness WEP has significant design flaws and vulnerabilities. • The integrity of the packets is checked using Cyclic Redundancy Check (CRC32). CRC32 integrity check can be compromised by capturing at least two packets. The bits in the encrypted stream and the checksum can be modified by the attacker so that the packet is accepted by the authentication system. This leads to unauthorized access to the network. • WEP uses the RC4 encryption algorithm to create stream ciphers.

The stream cipher input is made up of an initial value (IV) and a secret key. The length of the initial value (IV) is 24 bits long while the secret key can either be 40 bits or 104 bits long.

Trey songz na na na free mp3 download youtube. The total length of both the initial value and secret can either be 64 bits or 128 bits long. The lower possible value of the secret key makes it easy to crack it. • Weak Initial values combinations do not encrypt sufficiently. This makes them vulnerable to attacks.

• WEP is based on passwords; this makes it vulnerable to dictionary attacks. • Keys management is poorly implemented.

Changing keys especially on large networks is challenging. WEP does not provide a centralized key management system. • The Initial values can be reused Because of these security flaws, WEP has been deprecated in favor of WPA. WPA WPA is the acronym for Wi-Fi Protected Access. It is a security protocol developed by the Wi-Fi Alliance in response to the weaknesses found in WEP.

It is used to encrypt data on 802.11 WLANs. It uses higher Initial Values 48 bits instead of the 24 bits that WEP uses. It uses temporal keys to encrypt packets. WPA Weaknesses • The collision avoidance implementation can be broken • It is vulnerable to denial of service attacks • Pre-shares keys use passphrases. Weak passphrases are vulnerable to dictionary attacks.

How to Crack Wireless Networks WEP cracking Cracking is the process of exploiting security weaknesses in wireless networks and gaining unauthorized access. WEP cracking refers to exploits on networks that use WEP to implement security controls. There are basically two types of cracks namely; • Passive cracking– this type of cracking has no effect on the network traffic until the WEP security has been cracked. It is difficult to detect. • Active cracking– this type of attack has an increased load effect on the network traffic. It is easy to detect compared to passive cracking.