name: SSRC
full_form: Synchronization Source
context: 7.5.1-1: Security mechanism for media stream protection The AES-CM-128 algorithm as defined in IETF RFC 3711 [13] shall be supported as the SRTP PRF (which is used to derive the SRTP session key and salt). A SRTP key derivation rate of 0 shall be used to indicate that session keys and salts shall not be refreshed. The AEAD_AES_128_GCM algorithm as defined in IETF RFC 7714 [26] shall be supported for providing confidentiality and data authentication of SRTP packets. The AEAD_AES_128_GCM algorithm requires that the SRTP session key is 16 octets in length, and the SRTP session salt is 12 octets in length. Unless provided in the MIKEY message used to distribute the SRTP Master Key, the SSRC shall be randomly generated for each session. For group communications, the GMS shall not provide SSRCs, and hence the SSRC shall be randomly generated. Care should be taken to avoid SSRC repetition when a user uses the SRTP Master Key for more than one session. In particular, SSRCs shall not be
description: The Synchronization Source (SSRC) is a parameter used in Secure Real-time Transport Protocol (SRTP) to derive session keys and salts for media stream protection. It is randomly generated for each session, unless provided in the MIKEY message used to distribute the SRTP Master Key.
explanation: The context explicitly mentions SSRC as a parameter required for SRTP key derivation and salt generation, indicating its role as a critical network attribute for secure communication.
section_title: 7.5.1	General
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