Which statement best describes SRTP?

Which statement best describes SRTP?

• A. It provides a signaling encryption mechanism
• B. It is used to transport media unencrypted
• C. It exchanges keys for encryption
• D. It provides encryption for RTP media streams

Answer: (D)

SRTP is the protocol that protects real-time media by encrypting and authenticating RTP payloads. It gives confidentiality, integrity, and source authentication for audio and video streams carried in RTP, so even if someone intercepts the packets, they can’t understand or alter the media without detection. Signaling encryption and key exchange are handled by other mechanisms (for example, TLS for signaling; separate key-management protocols like SDES, DTLS-SRTP, or MIKEY handle how keys are distributed). SRTP itself focuses on securing the actual media stream, not the setup messages or the key exchange. That’s why it’s described as providing encryption for RTP media streams.

SRTP is the protocol that protects real-time media by encrypting and authenticating RTP payloads. It gives confidentiality, integrity, and source authentication for audio and video streams carried in RTP, so even if someone intercepts the packets, they can’t understand or alter the media without detection. Signaling encryption and key exchange are handled by other mechanisms (for example, TLS for signaling; separate key-management protocols like SDES, DTLS-SRTP, or MIKEY handle how keys are distributed). SRTP itself focuses on securing the actual media stream, not the setup messages or the key exchange. That’s why it’s described as providing encryption for RTP media streams.