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TARSNAP-RECRYPT(1)					    TARSNAP-RECRYPT(1)

NAME
       tarsnap-recrypt - re-encrypts data stored using tarsnap(1).

SYNOPSIS
       tarsnap-recrypt --oldkey old-key-file --oldcachedir old-cache-dir
       --newkey new-key-file --newcachedir new-cache-dir

DESCRIPTION
       tarsnap-recrypt downloads and decrypts data using old-key-file and re-
       encrypts and uploads it using new-key-file.  After all the data has
       been re-uploaded, tarsnap-recrypt deletes the data using old-key-file
       so that the only remaining copy of the data is encrypted using new-key-
       file.  The key file new-key-file must have been generated by tarsnap-
       keyregen(1) with old-key-file.

       tarsnap-recrypt checkpoints its progress after every 1-2 GB of data
       that it has copied; if it is interrupted it can be re-run and it will
       attempt to continue.

       Note that after tarsnap-recrypt completes it will be possible to store
       more archives using the key old-key-file and the cache directory old-
       cache-dir so care should be taken to disable any automatic (e.g.,
       cron(8)) archiving while tarsnap-recrypt is run.

EXAMPLES
       The following sequence of commands will create new keys and re-encrypt
       data, assuming that the currently used keys are in /root/tarsnap.key
       and the current cache directory is /usr/local/tarsnap-cache:

	   tarsnap-keyregen --keyfile /root/tarsnap.key.new --oldkey
	   /root/tarsnap.key --user me@example.com --machine myserver

	   tarsnap-recrypt --oldkey /root/tarsnap.key --oldcachedir
	   /usr/local/tarsnap-cache --newkey /root/tarsnap.key.new --new‐
	   cachedir /usr/local/tarsnap-cache.new

	   rm -r /usr/local/tarsnap-cache

	   mv /usr/local/tarsnap-cache.new /usr/local/tarsnap-cache

	   rm /root/tarsnap.key

	   mv /root/tarsnap.key.new /root/tarsnap.key

			       February 1, 2011		    TARSNAP-RECRYPT(1)

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