SRTP stands for Secure RTP.
SRTP is defined in IETF RFC 3711 specification.
On top of RTC, SRTP provides these security characteristics:
It is important to note that the header of an SCTP packet is never encrypted, providing some amount of meta data to those listening in to the transmission.
SRTP is coupled with SRTCP, the implementation of secure RTCP.
SRTP is the only media transport mechanism used by WebRTC.
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