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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? How to access 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. 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. It was developed for IEEE 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.
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The station encrypts the challenge with its key then responds. If the encrypted challenge matches the AP value, then access is granted. 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 bits long.
The total length of both the initial value and secret can either be 64 bits or bits long. The lower possible value of the secret key makes it easy to crack it.
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Weak Initial values combinations do not encrypt sufficiently. WEP is based on passwords; this makes it vulnerable to dictionary attacks. Keys management is poorly implemented.
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Changing keys especially on large networks is challenging. WEP does not provide a centralized key management system. It is used to encrypt data on 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. 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. In the field of cybersecurity and cryptography, password cracking plays a very major role.
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So, why do we need to learn about password cracking and the tools used to do so? The purpose of password cracking revolves around recovering the forgotten passwords of our online accounts, computers, and smartphones. Password cracking is also used by system administrators as a preventive measure.
Talking about the process of password cracking, most methods involve the use of a computer that generates a vast set of password candidates. A desktop computer tests more than hundreds of millions of passwords per second. The time needed to crack a password is proportional to the length and strength of that password.
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There are lots of other password cracking techniques like phishing, spidering, social engineering, shoulder surfing etc. Disclaimer: Fossbytes is publishing this list just for educational purposes. This free password cracking tool is chiefly written in C programming language. Encompassing a customizable password cracker, John the Ripper comes as a combination of many password crackers into one suite. A pro version of this tool is also available, offering better features and more effectiveness. Just like the popular hacking tool Metasploit, John also belongs to the Raspid7 family of security tools.
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Download link: John the Ripper. Aircrack-ng ng stands for new generation is one of the best password cracking tools that hackers use to bump their annoying neighbors off their own Wi-Fi. Note that just like John the Ripper, Aircrack-ng is not a single tool. Using the well know attack techniques like FMS, this password cracking tool makes your job easier. Download link: Aircrack-ng. As the name suggests, RainbowCrack makes use of rainbow tables to crack password hashes. This renowned password cracking tool is a dependable software to recover various types of passwords using multiple techniques.
This multi-purpose hacking tool also comes with the ability to sniff the networks, record VoIP conversations, recover network keys, decode scrambled passwords, and analyze routing protocols. Cain and Abel has two components. Download link: Cain and Abel. Using these protocols, THC Hydra performs super fast brute-force and dictionary attacks against a login page. This free-to-use tool helps the pentesters and security researchers to know how easy it would be to gain remote access to a system.
This tool also lets you add new modules to increase the functionality. HashCat claims to be the fastest and most advanced password cracking software available. Using a well-documented GPU acceleration, many algorithms can be easily cracked using this tool.