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Tarsnap is a secure online backup service for UNIX-like operating systems, including BSD, Linux and OS X. Created in 2008 by Colin Percival, Tarsnap encrypts and stores data in Amazon S3. The service is designed for efficiency, only uploading and storing data that has directly changed since the last backup.[1] Its security keys are known only to the user.[2] It was developed and debugged, with input solicited from security researchers and hackers, to try to find vulnerabilities.[3] An inadvertent yet serious nonce-reuse vulnerability was found by this process and fixed in 2011.[4]

See also[edit]


  1. ^ Fabbro, Andrew (August 2012). "Tarsnap: Online Backups for the Truly Paranoid". Linux Journal: 104–113. Retrieved August 21, 2012. 
  2. ^ Dragani, Rachelle (May 17, 2012). "Dropbox Security System Doesn't Lock Down Files, Says FTC Complaint". E-Commerce Times/Technewsworld.com. Retrieved August 21, 2012. 
  3. ^ Pauli, Darren (May 18, 2012). "AusCERT2012: FreeBSD talks amateur bug hunting". SC Magazine. Australia. Retrieved August 21, 2012. 
  4. ^ Edge, Jake (January 19, 2011). "Tarsnap advisory provides a few lessons". LWN.net. Retrieved August 21, 2012. 

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