Layer-4 wireless encryption

Wireless encryption is commonplace. For wireless users, encryption does not play any role, but can only prevent general security problems. However, in terms of password cracking, our encryption method is a fragile piece of paper. However, we must learn more about wireless encryption methods to protect our networks.

Wireless encryption method 1: WEP Encryption

A moderate-tech wireless hacker can quickly crack WEP encryption within two to three minutes. Although WEP has been proven to be outdated and inefficient, it is still supported in many modern wireless access points and routers.

In addition, it is still one of the most popular encryption methods used by individuals or companies. If you are using WEP wireless network encryption technology, if you pay great attention to the security of your network, do not use WEP as much as possible in the future, because it is really not very secure.

Wireless encryption method 2: WPA-PSK (TKIP) Encryption

Prior to the launch of the standard, the Wi-Fi alliance developed a security mechanism called WPA (Wi-FiProctedAccess) based on the draft 802.11i. It uses TKIP (temporary Key Integrity Protocol ), it uses the encryption algorithm RC4 used in WEP, so it does not need to modify the hardware of the original wireless device. WPA has the following problems in WEP: IV is too short, key management is too simple, and there is no effective protection for message integrity. The network security is improved through software upgrade.

WPA specifies two application modes: Enterprise mode and home mode (including small office ). Based on the two different application modes, WPA authentication also has two different methods.

For applications of large enterprises, "802.1x + EAP" is often used, and users provide the creden。 required for authentication. However, for some small and medium-sized enterprise networks or home users, WPA also provides a simplified mode that does not require dedicated Authentication servers. This mode is called "WPA pre-shared key (WPA-PSK)", which requires only one key in advance on each WLAN node (AP, wireless router, Nic, etc.

Wireless encryption method 3: WPA2-PSK (AES)

WPA2 is actually the second version of WPA. The reason why two versions of WPA appear is the commercial operation of the Wi-Fi Alliance.

Wireless encryption method 4: WPA-PSK (TKIP) + WPA2-PSK (AES)

This is the highest encryption mode in the current wireless route. Currently, this encryption mode is not used by many users due to compatibility issues. Currently, WPA-PSK (TKIP) and WPA2-PSK (AES) encryption modes are the most widely used. We believe that the encrypted wireless network will make our users feel at ease surfing the Internet.