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Michael Telatynski
Olm
Commits
8de0f1fb
Commit
8de0f1fb
authored
Oct 24, 2016
by
Mark Haines
Committed by
GitHub
Oct 24, 2016
Browse files
Merge pull request #32 from matrix-org/markjh/replay
Document the potential for message replays and possible mitigations
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docs/megolm.rst
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@@ -274,6 +274,17 @@ bytes preceding the signature.
Limitations
-----------
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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