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How secure is Dropbox?

Your files are actually safer while stored in your Dropbox than on your computer in some cases. We use the same secure methods as banks and the military.

Dropbox takes the security of your files and of our software very seriously. We use the best tools and engineering practices available to build our software, and we have smart people making sure that Dropbox remains secure. Your files are backed-up, stored securely, and password-protected.

Other Dropbox users can't see your private files in Dropbox unless you deliberately invite them or put them in your Public folder. Everything in your Public folder is, by definition, accessible to anyone.

Dropbox employees are prohibited from viewing the content of files you store in your Dropbox account, and are only permitted to view file metadata (e.g., file names and locations). Like most online services, we have a small number of employees who must be able to access user data for the reasons stated in our privacy policy (e.g., when legally required to do so). But that’s the rare exception, not the rule. We have strict policy and technical access controls that prohibit employee access except in these rare circumstances. In addition, we employ a number of physical and electronic security measures to protect user information from unauthorized access.
For Our Advanced Users

Dropbox uses modern encryption methods to both transfer and store your data.

  • Shared folders are viewable only by people you invite
  • All transmission of file data occurs over an encrypted channel (SSL).
  • All files stored on Dropbox servers are encrypted (AES-256)
  • Dropbox website and client software have been hardened against attacks from hackers
  • Public files are only viewable by people who have a link to the file(s). Public folders are not browsable or searchable

Dropbox uses Amazon's Simple Storage Service (S3) for storage, which has a robust security policy of its own. You can find more information on Amazon's data security from the S3 site or, read more about how Dropbox and Amazon securely stores data.

Last updated 4/23/2011 4:30 AM Categories: Security and Privacy

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