Which of the following is a method to protect sensitive information in communication?

Encryption is a method that transforms sensitive information into a secure format that can only be read or decrypted by someone with the appropriate key or code. This ensures that even if the data is intercepted during transmission, it remains unintelligible to unauthorized individuals.

Encryption is particularly important for protecting data in communication, as it addresses the vulnerabilities associated with transmitting information over various networks. By converting plaintext into ciphertext using encryption algorithms, it provides a significant layer of security against data breaches and unauthorized access.

In contrast, while firewalls serve as a barrier to prevent unauthorized access to networks, they do not specifically protect the content of communications. Password protection secures access to individual accounts or files rather than safeguarding sensitive information in transit. Likewise, two-factor authentication enhances the security of user accounts by requiring multiple forms of verification, but it does not encrypt the data itself during transmission.