Commit 8de0f1fb authored by Mark Haines's avatar Mark Haines Committed by GitHub
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Merge pull request #32 from matrix-org/markjh/replay

Document the potential for message replays and possible mitigations
parents d1a53586 884ad024
......@@ -274,6 +274,17 @@ bytes preceding the signature.
Message Replays
A message can be decrypted successfully multiple times. This means that an
attacker can re-send a copy of an old message, and the recipient will treat it
as a new message.
To mitigate this it is recommended that applications track the ratchet indices
they have received and that they reject messages with a ratchet index that
they have already decrypted.
Lack of Transcript Consistency
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