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replay protection
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... can provide confidentiality, message authentication, and replay
protection to the RTP traffic and to the control traffic ...
... RTP header and payload, and it
indirectly provides replay protection by authenticating
the sequence number. Note that the MKI ...
... receiver only (when
authentication and replay protection are provided), containing
indices of recently received and authenticated SRTP packets ...
... SRTCP packet,
* a separate replay list is maintained (when replay protection is
provided),
...
...
5. For message authentication and replay protection, first check if
the packet has been replayed (Section 3.3.2), using the Replay
List and the index as determined in Step 2. If the packet is
...
... the cryptographic context as in Section 3.3.1, using the packet
index estimated in Step 2. If replay protection is provided, also
update the Replay List as described in Section 3.3.2.
...
... i.e., not all of the index is explicitly carried in the SRTP packet.
For the pre-defined transforms, the index i is used in replay
protection (Section 3.3.2), encryption (Section 4.1), message
authentication (Section 4.2), and for the key derivation ...
... Replay Protection ...
...
Secure replay protection is only possible when integrity protection
is present. It is RECOMMENDED to use replay protection ...
... replay protection is only possible when integrity protection
is present. It is RECOMMENDED to use replay protection, both for RTP
and RTCP ...
... and authenticated. In practice, the list can use a "sliding window"
approach, so that a fixed amount of storage suffices for replay
protection. Packet indices which lag behind the packet index in the
context by more than SRTP ...
...
* SRTCP replay protection is as defined in Section 3.3.2, but using
the SRTCP index as the index i and a separate Replay List that is
...