Encrypted Storage on WebDAV
Encrypted Storage on WebDAV
- Subject: Encrypted Storage on WebDAV
- From: email@hidden
- Date: Sun, 19 Nov 2006 20:35:34 +0100 (MET)
Hi filesystem experts,
I am new on this list, so please forgive me if this is the wrong
place to ask.
I am trying to come up with an easy-to-implement solution to securely
store files on a WebDAV volume. Securely means the storage should
provide confidentiality by some form of encryption. The most simple
solution - an encrypted disk image stored on and mounted from the
WebDAV - does not work, because WebDAV-FS will upload the entire disk
image on any change. Now I am looking for some expertise on how to
satisfy my use case differently. Here are the options I came up with
so far:
1. Somehow fix WebDAV-FS to use partial down- and uploads. I don't
know if this is at all possible and it sounds quite complicated.
2. Somehow split the disk image's backing store on the WebDAV into
multiple small files, so that WebDAV-FS will work with and thus
upload smaller chunks of the image. I don't really know how to do this.
3. Don't use a disk image at all, but some form of per-file
encryption. This would involve stacking an encryption layer on top of
WebDAV-FS. It seems to me that Apple does not encourage stacked file
systems in VFS. However, I read something about implementing
something similar in user level as a local NFS server. However, there
seems to be no example code on how to do this, so I don't really know
where to start.
It would be very nice if someone with more knowledge could comment on
these options or maybe suggest something I overlooked.
Michael
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