Now there are free WIFIs in many announcements, and mobile users will try their best to save free traffic. However, there is no free lunch in the world. There is a big security risk in public WIFI. It is vulnerable to malicious attacks. In fact, regardless of the enterprise, the family or the operator, there are various security risks and threats in the layout of the wireless network.
Common wireless network security threats
The wireless network transmits and receives data through radio frequency signals that are broadcast in the air. Due to the broadcast nature of wireless LAN usage, there is a threat that hackers can access or corrupt data. The main hidden dangers are as follows:
1. Unauthorized use of network services
If the wireless LAN is set to open access mode, illegal users can use the network resources without authorization, which not only occupies valuable wireless channel resources, increases bandwidth costs, and reduces the service quality of legitimate users, and unauthorized users do not comply with the corresponding The terms may even lead to legal disputes.
2, address spoofing and session interception (man-in-the-middle attack)
In a wireless environment, it is much easier for an illegal user to obtain the MAC address of a legitimate site in the network by means of interception or the like than in a wired environment. These legitimate MAC addresses can be used for malicious attacks.
In addition, an illegal user can easily dress up as a legitimate wireless access point, inducing a legitimate user to connect to the access point to enter the network, thereby further obtaining the authentication identity information of the legitimate user, and implementing network intrusion through session interception.
Since the wireless network is generally an extension of the wired network, once an attacker enters the wireless network, it will become a starting point for further intrusion into other systems. Most of the deployed wireless networks are behind the firewall, so the security risks of the wireless network will become a loophole in the entire security system. As long as the wireless network is broken, the entire network will be exposed to illegal users.
Wireless network security measures
In order to alleviate the above security problems, all wireless networks need to add basic security authentication, encryption and encryption functions, including:
â— User identity authentication to prevent unauthorized access to network resources.
Data encryption to protect data integrity and data transmission privacy.
The authentication methods include:
First, open certification. Open authentication is basically an empty authentication algorithm that allows any device to send authentication requirements to an access point (AP). In open authentication, the client uses the plaintext to transfer the associated AP. If there is no encryption, any device that knows the wireless LAN SSID can enter the network. If Wired Equivalent Privacy (WEP) is enabled on the AP, the WEP key becomes a means of access control. A device that does not have the correct WEP key cannot transmit data through the AP even if the authentication succeeds, and such a device cannot decrypt the data sent by the AP.
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