Which of the following is considered the best method for ensuring wireless confidentiality?

Encryption is the best method for ensuring wireless confidentiality because it protects the data being transmitted over the wireless network from unauthorized access and eavesdropping. When data is encrypted, it is transformed into a code that can only be deciphered by those who have the correct decryption key. This means that even if an attacker intercepts the wireless signals, they would be unable to understand the information being shared without the key.

In wireless communications, where signals can travel through the air and be easily captured, relying solely on other methods such as firewalls or protocols like IPSec and SSH does not guarantee that the data itself remains confidential. While firewalls help filter out unauthorized access and IPSec provides secure communication over IP networks, they do not directly provide the encryption needed to protect data confidentiality in a wireless context. SSH, though secure for remote access, is also not specifically designed to ensure the confidentiality of all types of wireless communications. Thus, encryption stands out as the essential technique to safeguard data confidentiality in wireless environments.