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SDES (Session Description Protocol Security Descriptions) for Media Streams is a way to negotiate the key for Secure Real-time Transport Protocol. It has been proposed for standardization to the IETF in July 2006 (see RFC 4568 .)
SRTP relies on an external key management protocol to set up the initial master key. Two protocols specifically designed to be used with SRTP are ZRTP and MIKEY. There are also other methods to negotiate the SRTP keys. There are several vendors which offer products that use the SDES key exchange method.
The SDES protocol transmits the encryption keys in plain text inside SIP+SDP messages. This key exchange protocol is therefore pretty much useless for most users, unless they have a complete control over the SIP signalling system to ensure that the TLS transport protocol is used all the way from the originating to the receiving device. Even if ...
This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model.This list is not exclusive to only the OSI protocol family.Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.
The Data Encryption Standard (DES / ˌ d iː ˌ iː ˈ ɛ s, d ɛ z /) is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for modern applications, it has been highly influential in the advancement of cryptography.
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The protocol was derived from the UDT project, [2] which was designed for fast file transmission. It provided the reliability mechanism by utilizing similar methods for connection, sequence numbers, acknowledgements and re-transmission of lost packets.
Media gateway protocols were developed based on the Internet model of networking, the Internet Protocol Suite, and are referred to as device control protocols. A media gateway is a device that offers an IP interface and a legacy telephone interface and that converts media, such as audio and video streams, between them.