Which statement accurately describes TLS in data transmission?

Which statement accurately describes TLS in data transmission?

• A. TLS is used for email only.
• B. SSL is stronger than TLS.
• C. TLS provides encryption for data at rest.
• D. TLS provides encryption and authentication for data in transit.

Answer: (D)

TLS protects data as it travels across a network by providing both encryption and authentication. During the handshake, each end authenticates the other (often with certificates) and they agree on a session key. That key encrypts the transmitted data, keeping it confidential, and the protocol also includes integrity checks so you can detect any tampering. This is why TLS is used to secure many kinds of traffic, not just email—HTTPS for web pages, secure email transmissions (via StartTLS or SMTPS), and other protocols all rely on TLS to keep data in transit private and trustworthy. Data at rest, such as files stored on a disk, isn’t protected by TLS. That would require encryption at rest. SSL is the older protocol family that TLS superseded, and TLS is the current standard for secure transmission.

TLS protects data as it travels across a network by providing both encryption and authentication. During the handshake, each end authenticates the other (often with certificates) and they agree on a session key. That key encrypts the transmitted data, keeping it confidential, and the protocol also includes integrity checks so you can detect any tampering. This is why TLS is used to secure many kinds of traffic, not just email—HTTPS for web pages, secure email transmissions (via StartTLS or SMTPS), and other protocols all rely on TLS to keep data in transit private and trustworthy.

Data at rest, such as files stored on a disk, isn’t protected by TLS. That would require encryption at rest. SSL is the older protocol family that TLS superseded, and TLS is the current standard for secure transmission.