Such mechanisms may be implemented, for example, with the Secure Real-time Transport Protocol (SRTP) defined in RFC 3711.
Centers for Disease Control and Prevention | Transmission Control Protocol | File Transfer Protocol | Session Initiation Protocol | Centers for Disease Control | User Datagram Protocol | BitTorrent (protocol) | RTP | Kyoto Protocol | Internet Protocol | Post Office Protocol | Program and System Information Protocol | air traffic control | Simple Network Management Protocol | gun control | Media Control Charts | Internet Message Access Protocol | Network File System (protocol) | Hypertext Transfer Protocol | Lightweight Directory Access Protocol | Control Data Corporation | Board of Control for Cricket in India | The Olivia Tremor Control | Secure Real-time Transport Protocol | Real-time Transport Protocol | Christopher C. Kraft Jr. Mission Control Center | British Boxing Board of Control | Simple Mail Transfer Protocol | Montreal Protocol | Gun Control Act of 1968 |