https://bugs.freedesktop.org/show_bug.cgi?id=44318

--- Comment #5 from Bernard Gray <[email protected]> 2012-03-25 19:08:35 
UTC ---
I had a chat with some guys in the LibreOffice irc channel - and got an answer
on the problem:

The crux of the issue is that from 3.4.6 onwards (ODF format 1.2), they are
using an AES256 encryption algorithm for password protection, and previously
(ODF format 1.1 and earlier) the blowfish algorithm was used.

You can workaround the issue by setting the default save settings to ODF 1.1,
under Tools -> Options -> Load/Save -> General -> ODF Format Version ->
"1.0/1.1"

Obviously the risk with this workaround is that the older ODF version may not
support features in your document, but this could be used as a temporary
workaround while transitioning clients to current LOo/OOo versions.

I guess this makes it invalid as a bug, but certainly a difficult situation
that could potentially be handled differently/better - here's some suggestions:

1. ODF 1.2 to support blowfish AND AES256. If a document has already saved as
Blowfish, continue to save it as blowfish, with a warning.
2. Add a more granular setting in the Load/Save options - instead of forcing
the entire suite to use odf 1.1 or 1.2, allow a choice of encryption method
instead. ie ODF 1.2, blowfish cipher
3. Update the error message so that it is informational, for dealing with
future unsupported encryption methods.

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