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TARSNAP-KEYREGEN(1)	    General Commands Manual	   TARSNAP-KEYREGEN(1)

NAME
       tarsnap-keyregen	-- generate a key file for use with tarsnap-recrypt(1)

SYNOPSIS
       tarsnap-keyregen	  --keyfile   key-file	--oldkey  old-key-file	--user
			user-name   --machine	machine-name   [--passphrased]
			[--passphrase-mem maxmem] [--passphrase-time maxtime]
       tarsnap-keyregen	--version

DESCRIPTION
       tarsnap-keyregen	 generates  a set of cryptographic keys	which are com-
       patible with an existing	set of cryptographic keys, registers with  the
       tarsnap	server,	 and writes a key file for use with tarsnap-recrypt(1)
       and tarsnap(1).	The term "compatible" here means that it  is  possible
       to  re-encrypt  archives	stored with the	first set of keys to be	stored
       with the	second set of keys.  This is required because Tarsnap has some
       keys which need to stay the same	when  re-encrypting  data;  otherwise,
       existing	 archives  will	become unreadable and cannot be	used for dedu-
       plication.

       The --keyfile key-file option specifies the name	of the file  in	 which
       to  write  the  newly-generated keys.  The --oldkey old-key-file	option
       specifies the name of the file containing the  old  keys.   The	--user
       user-name option	specifies the name (i.e. email address)	of the Tarsnap
       account.	 The --machine machine-name option specifies a name which will
       be  displayed  in  accounting reports so	that you can see how much data
       each machine is storing.

       If the --passphrased option is specified, the user will be prompted  to
       enter a passphrase (twice) to be	used to	encrypt	the key	file.

       If the --passphrase-mem maxmem option is	specified, a maximum of	maxmem
       bytes  of RAM will be used in the scrypt	key derivation function	to en-
       crypt the key file; it may be necessary to set this  option  if	a  key
       file  is	 being generated on a system with far more RAM than the	system
       on which	the key	file will be used.

       If the --passphrase-time	maxtime	option is specified, a maximum of  ap-
       proximately  maxtime  seconds will be used in the scrypt	key derivation
       function	to encrypt the key file.

       The --version option prints the	version	 number	 of  tarsnap-keyregen,
       then exits.

FreeBSD	ports 15.0		March 20, 2025		   TARSNAP-KEYREGEN(1)

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