Cisco CCNA Networking Strategies

Posted on: March 30, 2020, by :

Network administrators can take steps to help protect their wireless network from outside threats and attacks. Most hackers will post details of any loops or exploits online, and if they find a security hole, they will come in droves to test your wireless network with it. WEP is used for wireless networks. Always change your SSID from the default, before you actually connect the wireless router to the access point. If an SSID broadcast is not disabled on an access point, the use of a DHCP server to automatically assign an IP address to wireless clients should not be used because war driving tools can easily detect your internal IP addressing if the SSID broadcasts are enabled and the DHCP is being used.

In this paper, we describe two attacks on IEEE 802.11 based wireless LANs. The first attack is an improved key recovery attack on WEP, which reduces the average number of packets an attacker has to intercept to recover the secret key. The second attack is (according to our knowledge) the first practical attack on WPA secured wireless networks, besides launching a dictionary attack when a weak pre-shared key (PSK) is used. The attack works if the network is using TKIP to encrypt the traffic. An attacker, who has about minutes access to the network is then able to decrypt an ARP request or response and send 7 packets with custom content to network.

Read More: 12 Steps to Maximize your Home Wireless Network Security

WPA was developed because of the vulnerabilities of WEP. WPA uses either a pre-shared key (WPA-PSK) or is used in combination with a RADIUS server (WPA-RADIUS). For its encryption algorithm, WPA uses either the Temporal Key Integrity Protocol (TKIP) or the Advanced Encryption Standard (AES).WPA2 was developed because of some vulnerabilities of WPA-PSK and to strengthen the encryption further. WPA2 uses both TKIP and AES, and requires not only an encryption piece but also an authentication piece. A form of the Extensible Authentication Protocol (EAP) is deployed for this piece.WPA-PSK can be attacked when the PSK is shorter than 21 characters. Firstly, the four-way EAP Over LAN (EAPOL) handshake must be captured. This can be captured during a legitimate authentication, or a reauthentication can be forced by sending deauthentication packets to clients. Secondly, each word of a word-list must be hashed with the Hashed Message Authentication Code – Secure Hash Algorithm 1 and two so called nonce values, along with the MAC address of the client that asked for authentication and the MAC address of the access point that gave authentication. Word-lists can be found at.LEAP uses a variation of Microsoft Challenge Handshake Protocol version 2 (MS-CHAPv2). This handshake uses the Data Encryption Standard (DES) for key selection. LEAP can be cracked with a dictionary attack. The attack involves capturing an authentication sequence and then comparing the last two bytes of a captured response with those generated with a word-list.WPA-RADIUS cannot be cracked. However, if the RADIUS authentication server itself can be cracked, then the whole network is imperilled. The security of authentication servers is often neglected.WPA2 can be attacked by using the WPA-PSK attack, but is largely ineffective.

Read More: Basic Networks Insight

In this article, I am going to discuss wireless security and best wi-fi password cracking or recovery tools. I will explain the kind of encryption wireless networks use and how these tools can crack the networks to get access. We will also see what tools let users monitor networks.

Wireless networks can be seen as inherently unsecure, potentially inviting unauthorized access by strangers who could pry into transmitted data. While various security protocols have been developed to protect wireless networks, weaknesses in the protocols themselves have cropped up over the years. The Wired Equivalent Privacy (WEP) encryption protocol, for instance, has been known to have many security flaws and be easily cracked. The FMS attack in 2001 demonstrates how the protocol’s weak encryption algorithm can be exploited to sniff initialization vectors just by passively monitoring the wireless traffic on a targeted network.

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For WEP cracking tools, the attackers use Aircrack, WEPcrack, Kismet and WEPDecrypt. For WPA cracking, tools like CowPatty, Cain & Abel are used. There are also other general types of tools used for Wireless network hacking such as Airsnort, wireshark, Netstumbler, Wifiphisher and so on.

The first step in protecting yourself people hacking wireless networks is to use WPA encryption. WEP, the older encryption technology, has been completely de-constructed by hackers and is now considered quite easy to crack. The second step is the use of a long, highly randomized encryption key. Long, random encryption keys are a pain in the butt to remember, but they’re much harder to crack.

Wireless network hacking is an information network attack similar to a direct invasion. Wireless security is the anticipation of illicit access or harm to computers, which includes Wi-Fi. The most common type is Wi-Fi security, which includes equivalent privacy which is wired and a Wi-Fi protected access . The password used can be broken in no time with widely available software tools.

Read More: Types Of Switching You Need To Know

Aircrack is the most popular and widely-known wireless password cracking tool. It is used as 802.11 WEP and WPA-PSK keys cracking tool around the globe. It first captures packets of the network and then try to recover password of the network by analyzing packets. It also implements standard FMS attacks with some optimizations to recover or crack password of the network. optimizations include KoreK attacks and PTW attack to make the attack much faster than other WEP password cracking tools. This tool is powerful and used most widely across the world. This is the reason I am adding it at the top of the list.

Discovered by the lead developer of the popular password-cracking tool Hashcat, Jens ‘Atom’ Steube, the new WiFi hack works explicitly against WPA/WPA2 wireless network protocols with Pairwise Master Key Identifier (PMKID)-based roaming features enabled.

This paper discusses the security problems existing in the encryption methods of WPA/WPA2 in wireless network and analyses the cracking method of WPA/WPA2 encryption. BackTrack5 that was lately issued is adopted to capture the 4-way handshake package in Linux System. Then, the handshake packets are copied to Win7 and cracked by EWSA-GPU. The comparison and analysis of data via this method with that of via cracking WPA/WPA2 by BackTrack4 prove that this method can greatly improve the cracking speed. Finally some encrypted strategies that against the new cracking methods are disposed.

 

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