"[a]ll files stored on Dropbox servers are encrypted (AES-256) and are inaccessible without your account password."
"We encrypt everything with a single key which anyone who has access to (law enforcement, DropBox employees, anyone who manages to hack into the DropBox network, etc, etc) can use to read all your files."
I'm guessing that Dropbox just wants to avoid the unpleasant scenario of a user losing their private key and being unable to recover their data from the server. The de-duplication is probably just a nice (for them!) side effect.
Recently someone released a filesharing tool called Dropship that let you share files through dropbox by exchanging the hashes. If Dropbox thinks you have a file it'll let you access it, because of this they had to turn off de-duplication.
We need a little dropbox & wuala de-de-duplicator that recognizes filetypes to safely insert garbage into the beginning of files. I vaguely though wuala handled the chunking up into blocks after the encryption phase, making file end modifications workable, but if dropbox or anyone encrypts after chunking then you must modify the file's beginning.
Dropbox provides 2GB of storage space to its customers for free. Consumers can purchase additional storage space, by signing up for one of two “Pro”service plans, offering 50GB for $9.99/month or $99.00/year, and 100GB for $19.99/month or $199.00/year.
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