SDES (Session Description Protocol Security Descriptions) for Media Streams and is a way to negotiate the key for Secure Real-time Transport Protocol.
To address the above shortcomings of the SDES protocol, Phil Zimmermann devised a military
The Schwinger–Dyson equations (SDEs), also known as the Dyson–Schwinger equations, named after Julian Schwinger and Freeman Dyson, are general relations between Green functions in quantum field theories (QFTs).