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Researcher uncovers serious privacy and security concerns with Dropbox

April 14, 2011

Dropbox, the popular cloud based backup service deduplicates the files that its users have stored online. This means that if two different users store the same file in their respective accounts, Dropbox will only actually store a single copy of the file on its servers.

The service tells users that it “uses the same secure methods as banks and the military to send and store your data” and that “[a]ll files stored on Dropbox servers are encrypted (AES-256) and are inaccessible without your account password.” However, the company does in fact have access to the unencrypted data (if it didn’t, it wouldn’t be able to detect duplicate data across different accounts).

This bandwidth and disk storage design tweak creates an easily observable side channel through which a single bit of data (whether any particular file is already stored by one or more users) can be observed.

If you value your privacy or are worried about what might happen if Dropbox were compelled by a court order to disclose which of its users have stored a particular file, you should encrypt your data yourself.

Read more about encrypting your data

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