Which protocol secures RTP?

Which protocol secures RTP?

• A. TLS
• B. SRTP
• C. S/MIME
• D. SSH

Answer: (B)

RTP streams carry media data but don’t encrypt it by themselves, so to protect real-time audio or video you use Secure Real-time Transport Protocol. SRTP adds encryption of the RTP payload, along with message integrity and anti-replay protections, so the media cannot be eavesdropped, altered, or replayed and the sender can be authenticated. TLS, by contrast, secures a transport/control channel (such as signaling like SIP), not the media path itself. S/MIME is for email encryption, and SSH is for secure remote login. Since SRTP directly secures the RTP traffic, it’s the protocol that protects real-time media streams.

RTP streams carry media data but don’t encrypt it by themselves, so to protect real-time audio or video you use Secure Real-time Transport Protocol. SRTP adds encryption of the RTP payload, along with message integrity and anti-replay protections, so the media cannot be eavesdropped, altered, or replayed and the sender can be authenticated. TLS, by contrast, secures a transport/control channel (such as signaling like SIP), not the media path itself. S/MIME is for email encryption, and SSH is for secure remote login. Since SRTP directly secures the RTP traffic, it’s the protocol that protects real-time media streams.