cryptar | secure , untrusting , differencing backup

cryptar is a C library. cryptar has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

see for a less technical description of cryptar and for some information about release times. cryptar is rsync with an encrypted remote image. that is, all data is compressed and encrypted locally, then sent to the remote host (where it is presumably useful to anyone but an authorized user with password). cryptar keeps local metadata to remember what chunks live on the remote host and so how to assemble diffs for further backup or for restore. a technical description of the algorithm lives in paper/abrahamson04cryptar.pdf. an updated version of the same paper lives in that directory, with expanded sections concerning applications and future directions. the paper was accepted to the 2004 nordu/usenix conference. sadly, cryptar is not finished, although much of its core functionality works. there's still a lot of duct tape holding it together. i wrote this while doing my phd, and so the product, unfortunately, was the paper (conference presentation) rather than the software. the code is often ugly -- the cleanup and refactoring phase never happened. i am sometimes asked for the