Hide the SSID wireless network ID. Is your wireless network really safe?

Wireless network security has always been a hidden danger. Most home users think that hiding the SSID wireless network ID can greatly improve network security. In fact, this idea is wrong, the hidden SSID wireless network ID cannot avoid intrusion and scanning problems, today, I will show you how to crack the real network ID information of the SSID wireless network by using a small tool within three minutes. I hope that more users will pay attention to the security issues of the wireless network through this article.

1. What is the SSID:

The Service Set Identifier can also be written as an Essid to distinguish different networks. It can contain up to 32 characters. A wireless network card can access different networks with different SSID settings, the SSID is usually broadcast by the AP. The scanning function provided by XP allows you to view the SSID in the current region. For security reasons, you do not need to broadcast the SSID. In this case, you must manually set the SSID to enter the corresponding network. In short, the SSID is the name of a wireless LAN. Only computers with the same SSID value can connect to the same wireless network to communicate with each other.

2. Three-minute cracking to hide the SSID wireless network:

In general, users can hide the SSID Network Information of wireless signals through routing or host settings. In this case, we can use the wireless signal scanning tool provided by the XP system to see the wireless network, in this case, the wireless signal management tool of the XP system can only view the wireless network that broadcasts the SSID.

　　

How can we find wireless networks that have hidden SSID information? In general, we do not know his SSID information, as long as we know it, we can use some cracking tools to capture packets to achieve the purpose of intrusion. In fact, it is not difficult to find the wireless network ID that hides the SSID broadcast. We can use related tools to accomplish this. In my experience, there are two ways to achieve this.

(1) netstumbler scan:

In our previous articles, we have repeatedly introduced the use of netstumbler, a wireless signal scanning tool. Today we will explain how to crack the hidden SSID wireless network. First, install netstumbler and then select the NIC for scanning. From the scan results, we can see that some network SSID information is empty, these networks are wireless networks that hide SSID broadcasts. For example, in this example, the MAC address is 001122334457, however, even if the SSID information is hidden, we can use netstumbler to learn about its basic parameters, such as the following speed, category, we can see the specific parameter information of the wireless network without the Broadcast SSID.

　　

Of course, after changing the NIC category under the device parameter of netstumbler, we can see that more wireless networks are displayed. The specific operation should be based on your actual needs.

　　

To scan the wireless network around the current environment to the maximum extent, we can view it using the use any suitable device option under the device menu of netstumbler.

　　

After selection, we can see that all the Broadcast SSID and the wireless networks that disable the broadcast can be clearly displayed in the window on the right of netstumbler, the recorded information includes the currently working wireless network and the previously scanned wireless network information.

　　

(2) scanning by DD-WRT:

In addition to netstumbler scanning the wireless network that hides the SSID on this machine, we can also find this type of wireless network through the tool that comes with the DD-WRT firmware. The procedure is as follows.

First log on to the DD-WRT management interface, and then find the Wi-viz button under wireless management to enable the Wi-viz wireless scanning tool. After enabling, we will see that "Wi-viz" will automatically scan the wireless network around the current DD-WRT wireless router, if you can find the wireless network SSID information will be directly displayed, for example, if the softer in this example hides the SSID information, the MAC address of the wireless router is displayed directly. For example, 00: 19: E0: CC: 95: Be In this example.

　　

After the MAC address 00: 19: E0: CC: 95: Be, we can also see the signal of the wireless network from the Access Point Information next to it, whether or not to encrypt the information, such as the encryption method.

With "Wi-viz", we can not only scan the wireless routers and wireless networks in the surrounding environment, but also the wireless clients. In short, if a wireless network is found in the form of a MAC address, it should be a wireless network that hides the SSID broadcast.

　　

Iii. Summary:

Wireless Networks that hide the SSID network number broadcast are not secure. In this article, we use two examples to find these networks. We hope that this article will allow more readers to pay attention to wireless network security, do not only use the method of hiding SSID broadcast for security defense. If necessary, you must use WEP, WPA, and other encryption methods to prevent illegal intruders by filtering MAC addresses.