Am 02.01.2012 22:50, schrieb James Broadhead: > I have a pile of files, and a personal svn repo totalling around 13GiB > which I want to back up to cheaply to 'the cloud'. I would also like > it to be non-trivial for someone with access to the cloud servers to > decrypt my data. > > I have a 50GB free account for Box.net, but would consider others if > they have significant advantages. The box.net account is only allowed > upload files of max 100MiB at a time. > > Now one problem facing me is that most cloud services don't give > assurances of bit parity, so I'd like to be able to recover most of > the files if I lost my local copies and there were bits missing from > the uploaded backup. This makes the one-big-encrypted-file approach a > no-go. > > My current approach is to use split-tar, with the intention of > encrypting each file separately. (Is this worse / equivalent to having > one big file with ECB ? )
I could be wrong but I don't think you will find any reasonable encryption tool that only offers encryption equivalent to ECB. The number of files should not matter as the encryption tool can use a randomized IV with CBC. > http://www.informatik-vollmer.de/software/split-tar.php > ...but this seems to have difficulty sticking below the 100MiB > individual file limit (possibly there are too many large files in the > svn history). > Why not split them further when the files are still above the 100M limit after splitting them with that tool? split + cat should do the trick. > Any thoughts? I'm sure that many of you face this problem. > Well, I have no experience with their service (although I always planned to use them), but maybe you can try these guys [1]. They don't have file size limits and support everything working over ssh (including sshfs) as well as duplicity for file encryption. Of course, having only US locations could be a no-go depending on your legal considerations/restrictions. [1] http://www.rsync.net/ Regards, Florian Philipp
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