Which of the following is commonly used to protect telemetry links?

• A. Encryption, authentication, access controls, and secure key management
• B. Plaintext transmission over open channels
• C. Publicly shared user accounts
• D. Exclusively hardware-based security with no encryption

Answer: (A)

Securing telemetry links relies on a layered approach that protects data in transit and verifies who is communicating. Encryption locks the content so that even if someone eavesdrops, they can’t read it. Authentication confirms the identities of both ends, preventing impersonation by an attacker posing as the server or the device. Access controls restrict who can access the data or commands, reducing the risk of unauthorized reading or manipulation. Secure key management ensures encryption keys are stored securely, rotated regularly, and protected from compromise, so the encryption remains effective over time.

Plaintext transmission would expose sensitive data and enable tampering or impersonation. Publicly shared user accounts are inherently insecure and easy to misuse. Relying exclusively on hardware-based security with no encryption leaves data unprotected in transit. Using the combination of encryption, authentication, access controls, and secure key management provides robust protection for telemetry links.