[Libreoffice] [PATCH/REVIEW-3-4] Backport reading AES-encrypted ODF 1.2 documents (as genereated by LibO 3.5)

[Michael Stahl]

On 19/11/11 09:40, Cor Nouws wrote:
> Stephan Bergmann wrote (18-11-11 15:27)
>> On 11/18/2011 02:21 PM, Cor Nouws wrote:
>>> So I have to interpret it as:
>>> an encrypted document from 3.5 opened in 3.4 will be saved
>>> with the old encryption, without notice?
>>
>> Yes. Sorry for my unclear muttering.
> 
> No probs - we are at it now. ;-)
> 
> So for the release notes something as follows would be appropriate:
> " 3.4.5
> In LibreOffice 3.5 a new stronger encryption will be introduced. As 

am not sure "stronger" is appropriate here, AFAIK the main motivation
for the change was that the new algorithm (AES) is "standard" and
implemented by others like Microsoft as well while the old one
(Blowfish) is not; there is no serious weakness with Blowfish that users
should be aware of.

> consequence files encrypted in LibreOffice 3.5 can not be opened by 
> LibreOffice 3.4.4 and earlier.
> LibreOffice 3.4.5 enables you to open those files. However, on saving 
> again in LibreOffice 3.4.5, the old encryption will be used.
> Files with the old encryption of course can be used in LibreOffice 3.5.0 "
> 
> OK?
>