Gnupg good for big groups?

Dotan Cohen dotancohen at
Sat Aug 7 16:57:38 CEST 2010

On Wed, Aug 4, 2010 at 03:51, Snaky Love <snakylove at> wrote:
> Hi,
> I would like to better understand: is gnupg good for big groups?
> I would like to encrypt communication in groups - not instant communication
> like e.g. messengers like pidgin, but like on a forum or web-group - the
> data persists in an archive,  where the communication can be read. Members
> are coming and leaving a group constantly - that means if somebody leaves
> the group, she should not be able to read the content decrypted anymore, and
> if anybody attaches the group all the old content optionally must be
> encrypted with her key so she can read all data belonging to this group.
> well, maybe you get the idea. It´s basically like a forum or mailing list
> with an archive.
> With my understanding of gnupg I see no other way than to store the data NOT
> encrypted - in a database or wherever, perhaps on an encrypted disc to
> compensate for the data not being encrypted - and then to encrypt the data
> on the fly with the pubkey of the user after the user logged into the
> website and is checked to belong to the right group.
> But doing this would be stupid, as it would basically use gnupg only for
> transport - but there is already SSL and TLS existing for this purpose.
> So is there any trick to encrypt data at creation time for unknown future
> users?
> And how can I remove users from the group of allowed users without
> re-encrypting the content? Is this possible to realize at all without having
> to keep the original unencrypted content?
> Is this scenario - group communication - not a use-case for gnupg at all?
> Thank you very much for your attention!
> Have a nice day,
> Snaky

Sounds to me like you just need a password-protected online forum such
as PHPbb or such.

Dotan Cohen

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