Open System Authentication is the simplest and least secure wireless authentication method. Any device can connect to the network without providing any credentials.
WEP is an early encryption-based authentication protocol that uses a shared key to authenticate devices. However, WEP is considered weak and easily hackable, and it is no longer recommended for securing wireless networks.
WPA/WPA2-PSK authentication method uses a pre-shared key (password) known to both the client device and the wireless router. This key is used to authenticate and encrypt the data. While it provides better security than WEP, it is still vulnerable to brute-force attacks on weak passwords.