[messaging] Message persistence

[Natanael]

Den 15 jan 2015 03:47 skrev <steve at actor.im>:
>
> Hi everyone,
>
> Are there some best practices for keeping all encrypted message history
securely on server or on client for accessing them later with single
hardware or software key like ubikey?

To preserve PFS, let the client re-encrypt and upload. The client cloud
sign or MAC the ciphertext to prevent modification.
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