name: MKI
full_form: Master Key Identifier
context: to support and use for e2e security, shall not be used for e2ae security (cf. clauses 7.2.1 and 7.3.1 of this specification). Master Key Index (MKI): optional to support, mandatory to use if more than one set of key parameters is contained in the crypto attribute, otherwise optional to use. If only one master key is used, an MKI is not recommended to be used. NOTE: It is not guaranteed that implementations support more than one master key per crypto attribute. If only one master key is used, an MKI has no function as it adds to the SRT(C)P packet overhead. Length of MKI field: optional to support, mandatory to support if MKI is supported, mandatory to use if MKI is used. "SESSION PARAMETERS" key derivation rate: optional to support and use UNENCRYPTED_SRTP: mandatory to support and optional to use UNENCRYPTED_SRTCP: mandatory to support and optional to use UNAUTHENTICATED_SRTP: mandatory to support and optional to use NOTE: The flags âUNENCRYPTED_SRTPâ and âUNENCRYPTED_SRTCPâ may be
description: The Master Key Identifier (MKI) is an optional field used in SDES profiling for end-to-end security. It identifies the master key employed for encryption and decryption operations. If multiple sets of key parameters are present within a crypto attribute, the MKI becomes mandatory.
explanation: The text describes MKI as a field that identifies a master key within a cryptographic context, aligning with the definition of a parameter.
section_title: Annex E (normative):
  Profiling of SDES
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