WPA是 Wi-Fi® Protected Access(Wi-Fi保护接入)的简称,是无线网络的数据加密规格. 它通过使用可扩展认证协议 (EAP) 提高WEP安全功能来确保网络使用的安全性,通过一种加密方法提高了数据传送的安全性.

WPA使用802.1X认证服务器给每个用户分配不同的密钥. 但是它在安全性比较差的 "预先共享密钥 (PSK)" 模式中也有效. PSK用于家庭和小型办公室网络,每个用户都有同样的密码口令. WPA-PSK 也叫做 WPA-Personal(WPA个人). WPA-PSK使用TKIP或AES加密方法把Brother无线设备和接入点联系起来.WPA2-PSK使用AES加密方法把Brother无线设备和接入点联系起来.

TKIP是 Temporal Key Integrity Protocol(临时密钥完整性协议)的简称,是一种加密方法.TKIP提供结合信息完整性检查和重新按键机制的信息包密钥.

AES是Advanced Encryption Standard(高级加密标准)的简称,是 Wi-Fi® 授权的高效加密标准.

WPA-PSK/WPA2-PSK和TKIP或AES使用预先共享密钥 (PSK),字符长度大于8并且小于6。

如果你的路由器（router）设置加密方法和算法低于WPA2+AES的加密算法的话，苹果MAC系统在接入该路由器wifi的会提示安全告警。

下面是苹果官方网站对加密方式和加密算法的指导意见。注意其中“WPA2 Personal (AES)”说的就是WPA2-PSK

To ensure that your devices can connect securely and reliably to your network, apply these settings consistently to each Wi-Fi router and access point, and to each band of a dual-band, tri-band, or other multiband router.

Set to WPA3 Personal for better security Set to WPA2/WPA3 Transitional for compatibility with older devicesThe security setting defines the type of authentication and encryption used by your router, and the level of privacy protection for data transmitted over its network. Whichever setting you choose, always set a strong password for joining the network.

Weak security settings to avoid on your routerDon't create or join networks that use older, deprecated security protocols. These are no longer secure, they reduce network reliability and performance, and they cause your device to show a security warning:

Settings that turn off security, such as None, Open, or Unsecured, are also strongly discouraged. Turning off security disables authentication and encryption and allows anyone to join your network, access its shared resources (including printers, computers, and smart devices), use your internet connection, and monitor the websites you visit and other data transmitted over your network or internet connection. This is a risk even if security is turned off temporarily or for a guest network.

下面是一个路由器的设置，供参考，这样mac就不会有wifi接入安全告警。