name: SRTP
full_form: Secure Real-Time Transport Protocol
context: 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. The SRTP authentication tag may be appended to every 'rth' packet as defined in IETF RFC 4771 [24] to provide the SRTP ROC counter to MCPTT UEs performing a late-entry to the communication. A 'mode 3' integrity transform (RCCm3) shall be supported for transmitting the ROC within a 4 octet SRTP authentication tag. NOTE: The ROC and MKI fields of the SRTP packet are not authenticated as part of the AEAD_AES_128_GCM
description: Secure Real-Time Transport Protocol (SRTP) is a protocol used for securing real-time communications, such as voice and video calls. It provides confidentiality, integrity, and authentication for RTP (Real-time Transport Protocol) packets.
explanation: The text describes SRTP as a protocol that secures real-time communications by providing confidentiality, integrity, and authentication for RTP packets. This clearly defines its role as a set of rules governing data transmission, making it a protocol.
section_title: 7.5.1	General
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