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Why Wireless Bridges Are Encrypted in Wireless Bridges in Wireless Surveillance Systems
After the customer purchases the wireless bridge in Laion, the staff of Laion will always remind the wireless bridge to encrypt the wireless signal. So, is this encryption necessary?
Today, wireless bridges occupy an important place in the surveillance system. Many contractors have good results when they start using wireless bridges, and the images are clear and smooth. After a certain period of time, images appear to be stuck and data is lost. Package, delay large phenomenon. When these problems arise at the beginning, it will be questioned whether the quality or stability of the wireless bridge is not good enough. However, after the technicians analyzed the operation data of the bridge, they found that the hardware and software of the wireless bridge itself did not have any problem, but it was found that the device as an access point appeared with multiple wireless terminals connected. The devices are some other wireless terminals, and more often the mobile phone access. From this, it can be analyzed that engineers have installed wireless bridges, and they have completely ignored the encryption of wireless bridges since the beginning of stable operation. It may also be completely unaware of the importance of encryption for wireless bridges.
Now is a WIFI era, the basic state of the people is to first connect WIFI to a place, most of the smart phones support a/b/g/n these wireless protocols, and even support a higher level of wireless. Even if the 5.8G bridge is used for monitoring, it is a relatively clean and strong anti-jamming device. However, an open wireless signal broadcast will inevitably lead to a lot of useless terminals that automatically add in. The wireless bridge load. As time moves, more and more terminals are accessed, and the efficiency of wireless network bridge self-network signal transmission will be reduced. Packet loss and delay will occur.
To solve the above problems, it is necessary to encrypt the wireless bridge, and even through some special means to ensure that other wireless terminals cannot access. The common encryption method for wireless bridges is as follows.
1, MAC address filtering
MAC address filtering uses a hardware-controlled mechanism to identify access to wireless terminals. Because the wireless terminal's network card has a unique MAC address, if the MAC address filtering mechanism is enabled, the wireless bridge allows the terminal to communicate only when the MAC address of the client is a valid MAC address.
2, SSID hidden
The SSID can generally be obtained through terminal scanning. The wireless network bridge supports the function of hiding the SSID so that the wireless terminal cannot automatically scan and acquire the SSID, which can prevent the terminal from accessing the wireless network bridge.
3, WEP encryption
The wireless network implements an encryption mechanism based on a shared secret key in the 802.11 protocol, and is called "Wired Equivalent Privacy WEP" technology. WEP is a 40-bit or 128-bit encryption method based on the RC-4 algorithm. The mobile terminal and the wireless router can be configured with four WEP encryptions, which can be used in turn to encrypt and transmit data, allowing the encryption key to change dynamically. High encryption level, basically meet the needs of ordinary business users.
4, 802.1x authentication technology
802.1x refers to port access control technology and is an important part of the 802.11i wireless security protocol family. It is an enhanced network security solution for wireless data networks. When the wireless terminal is associated with the wireless bridge, whether the wireless bridge service can be used depends on the 802.1x authentication result. If the authentication succeeds, the device opens the logical port for the terminal. Otherwise, the user is not allowed to access the Internet.
5, AES algorithm encryption
AES refers to the advanced encryption standard algorithm and is an important part of the 802.11i wireless security protocol family. AES is a symmetrical block encryption technology and provides higher-level encryption performance than RC-4 algorithm in WEP/TKIP. AES is more random. It has higher security than WEP. Attackers need to obtain a large number of ciphertexts, consume a lot of resources, and spend more time deciphering. Using AES encryption, the security of the wireless network will be greatly improved, which can effectively prevent external attacks.
From the above, we can see that if you use a wireless bridge for monitoring, you must pay attention to its encryption function, the more the better the encryption. For example, the wireless network bridge of Lai'an Technology supports MAC address filtering, WEP encryption, 802.1x authentication technology, WPA, WPA2 and other encryption methods. In this way, it is more secure and the wireless signal transmission is more stable. If you don't understand this aspect, you can call Lian Technology Co., Ltd. for consultation at any time.