Steven D'Aprano wrote: > On Fri, 10 Mar 2006 15:13:07 +0100, robert wrote: > > >>Hello, >> >>I want to put (incrementally) changed/new files from a big file tree >>"directly,compressed and password-only-encrypted" to a remote backup >>server incrementally via FTP,SFTP or DAV.... At best within a closed >>algorithm inside Python without extra shell tools. > > > What do you mean by "closed algorithm"? > > The only thing I can think of is you mean a secret algorithm, one which > nobody but yourself will know. So let's get this straight... you are > asking a public newsgroup dedicated to an open-source language for > somebody to tell you a secret algorithm that only you will know? > > Please tell me I've misunderstood.
no. I meant it terms of 'cohesive' : A Python solution without a lot of other tools. (Only the password has to be secret) >>(The method should work with any protocol which allows somehow read, >>write & seek to a remote file.) >>On the server and the transmission line there should never be >>unencrypted data. > > > Break the job into multiple pieces. Your task is: > > - transmit information to the remote server; > > Can you use SSH for that? SSH will use industrial strength encryption, > likely better than anything you can create. Yes, sftp (=SSH) or ftp with TSL (=SSL) are good protocols. They can also read/navigate in a remote fila and append-to-file. But how about incremental+encrypted? > - you want to update the files at the other end; > > Sounds like a job for any number of already existing technologies, like > rsync (which, by the way, already uses ssh for the encrypted transmission > of data). As far as I know, rsync cannot update compressed+encrypted into an existing file(set) ? I any case with rsync I would have to have a duplicate of the backup file geometry on the local machine (consuming another magnitude of the file stuff itself) ? Thats why I ask: how to get all these tasks into a cohesive encrypted backup solution not wasting disk space and network bandwidth? Robert -- http://mail.python.org/mailman/listinfo/python-list