Basic Networks Insight

Posted on: March 30, 2019, by :

Wireless networks or WiFi are the current generation most preferred medium of network connectivity but they are subjected to a lot of security issues. If the attacker has access to the network connection, then he can easily sniff the network packets from nearby location. They use sniffing to find the SSID and hacks wireless network, then they monitor the devices connected to the same network SSID. If you are using WEP authentication, then it can subjected to dictionary attacks. They use RC4 encryption algorithm to create stream ciphers which is easy to crack. If you are using WPA authentication, then it is vulnerable to DOS attacks and dictionary attacks.

This is an overview of the various types of wireless (802.11) networks, available encryption security systems (WEP, WPA, and WPA2), and how to use open-source tools to hack and crack these vulnerable wireless (WiFi) networks. Since their introduction in 1999, wireless networks have been rapidly expanding in their usage and availability. Unfortunately, many people believe these wireless networks are designed as a secure solution for sharing data, but this is rarely the case. In this course, you will gain a deeper understanding of the WEP, WPA, and WPA2 wireless security protocols, and how to exploit their vulnerabilities in order to gain access to any wireless network during a penetration test. You will use this information to increase the security of your networks and to implement a better defensive security posture to prevent an attacker from accessing your networks.

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The above collection also contains those tools which try a dictionary attack to crack wi-fi passwords to allow you to get free Internet access. But be sure not to use these tools in a risky place. Hacking wireless networks to get unauthorized access may be a crime in your country. You may get into trouble for using these tools. So, please do not use these tools for illegal works. As I already mentioned, you should never use the WEP encryption key in your home or wireless network. With available tools, it is child’s play to crack the WEP keys and access your wi-fi network.

WEP and WPA are the two main security protocols used in Wi-Fi LAN. WEP is known as Wired Equivalent Privacy (WEP). It is a deprecated security protocol which was introduced back in 1997 as a part of original 802.11 standards. But it was weak, and several serious weakness were found in the protocol. Now, this can be cracked within minutes. So, a new kind of security protocol was introduced in 2003. This new protocol was Wi-Fi Protected Access (WPA). It has mainly two versions, 1 and 2 (WPA and WPA2). Now it is the current security protocol used in wireless networks. To get unauthorized access to a network, one needs to crack these security protocols. There are many tools which can crack Wi-Fi encryption. These tools can either take advantage of WEP weaknesses or use bruteforce attacks on WPA/WPA2. I am sure now you know that you should never use WEP security.

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Wireless networks are convenient and popular, but poor configuration and encryption leave them open to attack. Hackers can use Wi-Fi vulnerabilities to infiltrate your entire network. Security professionals need to know how to detect, prevent, and counter these kinds of attacks using the latest tools and techniques—the subject of this course with cybersecurity expert Malcolm Shore. Malcolm covers everything from configuring basic security to understanding how hackers extract passwords, harvest connections at rogue access point, and attack networks via Bluetooth. He also explains how to select the right antennae for testing and introduces some sophisticated Windows and Linux tools to scan for vulnerabilities, including Acrylic, Ekahau, and Wireshark. By the end of the course, you should be able to shore up your wireless connections and gain confidence that your local network is safe to use.

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The configuration of wireless network card modesChanging the MAC address of the wireless network cardFinding a hidden access point with disabled ESSID broadcastThe use of deauthentication attack for jamming network trafficThe overview and demonstration of the chop-chop attackGenerating packets without knowing the network keyInteractive packet replay and ARP request replayThe demonstration of the PTW and KoreK attacksCreating a fake access point – the Caffe Latte attackThe dictionary attack on WPA/WPA2The dictionary attack on WPA/WPA2 – using hash tablesCUDA – the initial preparation of the environmentThe installation of CUDA-SDK and CUDA-ToolkitThe compilation and installation of the tools with CUDA supportThe optimization of the parameters of an nVidia video cardCUDA – preparation for the attackCUDA – the attack on WPA/WPA2Generating your own dictionaryApplications for cracking MD4 and MD5 hashes with the use of CUDA technologyPlease be advised that all the techniques presented in this course can only be used ethically and in your own testing / researching environment. Note that you will get all the required tools and information to prepare your own training system. Please see the Legal information in the 1st section for further legal reference.

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Wireless networks have posed a threat in Data Security that has stuck to the core of data communication between two points. Absence of inflexible security measures has made numerous organizations contribute millions to verify their systems. Development of different security conventions for Wireless LANs has been given in this paper. Also, vulnerabilities of WEP/WPA/WPA2/WPA3 have been discussed and how the wireless networks are attacked using the design flaws present in these Wireless Security Protocols. The use of different tools and programming languages used for testing the strength of the protocols. Tools like nmap, zenmap, aircrack-ng, etc., are used in the Linux environment to practically demonstrate the attacks against these networks using WEP/WPA/WPA2/WPA3 protocols. The solutions for the shortcomings in WEP has been applied in WPA, similarly WPA2 and WPA3.

Wireless Local Area Networks frequently referred to as WLANs or Wi-Fi networks are all the vehemence in recent times. People are installing these in houses, institutions, offices and hotels etc, without any vain. In search of fulfilling the wireless demands, Wi-Fi product vendors and service contributors are exploding up as quickly as possible. Wireless networks offer handiness, mobility, and can even be less expensive to put into practice than wired networks in many cases. With the consumer demand, vendor solutions and industry standards, wireless network technology is factual and is here to stay. But how far this technology is going provide a protected environment in terms of privacy is again an anonymous issue. Realizing the miscellaneous threats and vulnerabilities associated with 802.11-based wireless networks and ethically hacking them to make them more secure is what this paper is all about. On this segment, we’ll seize a look at common threats, vulnerabilities related with wireless networks. And also we have discussed the entire process of cracking WEP (Wired Equivalent Privacy) encryption of WiFi, focusing the necessity to become familiar with scanning tools like Cain, NetStumbler, Kismet and MiniStumbler to help survey the area and tests we should run so as to strengthen our air signals.

People also use wireless in their home network to connect all devices. Every person can see the neighborhood wi-fi networks in the system, and they want to use it for free. But most these networks are secured with a password key. You need to know this security key to access the network. When your own network is down, you will desperately want to connect to these neighborhood networks. For this, people generally search for wi-fi password cracking tools to get unauthorized access to those wireless networks.

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