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Add a sentence on KT for signing key compromise by the AS
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@beurdouche
beurdouche committed Jan 19, 2024
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3 changes: 2 additions & 1 deletion draft-ietf-mls-architecture.md
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Expand Up @@ -1375,7 +1375,8 @@ keys and all shared group keys, but Alice performs a key update at time t2, then
the attacker is unable to violate any of the MLS security properties after the
updates have been processed.

Both of these properties are satisfied even against compromised DSs and ASs.
Both of these properties are satisfied even against compromised DSs and ASs
in the case where a Key Transparency mechanism is in use.

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@ekr

ekr Jan 20, 2024

Collaborator

I would suggest "Where some other mechanism for verifying keys is in use, such as key transparency" and then put a reference.

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@beurdouche

beurdouche Jan 20, 2024

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Fixed in 167754b

Confidentiality is mainly ensured on the client side. Because Forward Secrecy
(FS) and Post-Compromise Security (PCS) rely on the active deletion and
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