Tarsnap is a secure online backup service for

UNIX Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, a ...

-like operating systems, including BSD,

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which i ...

, and

OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and la ...

. It was created in 2008 by Colin Percival. Tarsnap encrypts data, and then stores it on Amazon S3.

Service

The service is designed for efficiency, only uploading and storing data that has directly changed since the last backup. Its security keys are known only to the user. It was developed and debugged, with input solicited from bug bounty hunters, to try to find vulnerabilities. A serious

nonce Nonce may refer to: * Cryptographic nonce, a number or bit string used only once, in security engineering * Nonce word, a word used to meet a need that is not expected to recur * The Nonce, American rap duo * Nonce orders, an architectural term ...

-reuse vulnerability was found by this process and fixed in 2011. The document of the presentation "From bsdtar to tarsnap" by Percival from EuroBSD-Con 2013 contains "all kinds of detail on exactly how the algorithms work, how deduplication is managed ... the innards of how Tarsnap works"

References

External links

* {{Official website
Tarsnap presentation on crowd-sourcing bug bounties
Online backup services Backup software File hosting Cloud storage Web services Network file systems S3

Service

See also

References

External links