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AMGPGCRYPT(8)		System Administration Commands		 AMGPGCRYPT(8)

NAME
       amgpgcrypt - reference crypt program for	Amanda public-key data
       encryption

SYNOPSIS
       amgpgcrypt  to be called	by Amanda only

DESCRIPTION
       amgpgcrypt calls	gpg to perform public-key data encryption on Amanda
       backup.	amgpgcrypt will	search for the gpg program in the following
       directories: /usr/local/bin:/usr/bin:/usr/sbin:/bin:/sbin

       amgpgcrypt sets GNUPGHOME to $AMANDA_HOME/.gnupg	where gpg will look
       for the gpg keys.  amgpgcrypt uses the public key to encrypt the	Amanda
       data and	uses the private key to	decrypt	the Amanda backup data.	Thus,
       passphrase is only required at the time of data restore.

KEY AND	PASSPHRASE
       amgpgcrypt uses the private key to decrypt Amanda backup	data.

       It is very important to store, manage and  protect the key and the
       passphrase properly. Encrypted backup data can only be recovered	with
       the correct key and passphrase.

HOW TO CREATE ENCRYPTION KEYS AND PASSPHRASE FOR AMGPGCRYPT
       Store the passphrase that you used in following "gpg --gen-key" command
       inside the home-directory of the	AMANDA-user($amanda_user) and protect
       it with proper permissions:

	  echo my_secret_passphrase > ~$amanda_user/.am_passphrase
	  chown	$amanda_user:disk ~$amanda_user/.am_passphrase
	  chmod	700 ~$amanda_user/.am_passphrase

       Run "gpg	--gen-key". Below is an	example:
       $ gpg --gen-key
       gpg (GnuPG) 1.2.6; Copyright (C)	2004 Free Software Foundation, Inc.
       This program comes with ABSOLUTELY NO WARRANTY.
       This is free software, and you are welcome to redistribute it
       under certain conditions. See the file COPYING for details.

       Please select what kind of key you want:
	  (1) DSA and ElGamal (default)
	  (2) DSA (sign	only)
	  (4) RSA (sign	only)
       Your selection? 1
       DSA keypair will	have 1024 bits.
       About to	generate a new ELG-E keypair.
		     minimum keysize is	 768 bits
		     default keysize is	1024 bits
	   highest suggested keysize is	2048 bits
       What keysize do you want? (1024)
       Requested keysize is 1024 bits
       Please specify how long the key should be valid.
		0 = key	does not expire
	     (n)  = key	expires	in n days
	     (n)w = key	expires	in n weeks
	     (n)m = key	expires	in n months
	     (n)y = key	expires	in n years
       Key is valid for? (0) 6m
       Key expires at Sun 06 Aug 2006 03:51:25 PM PDT
       Is this correct (y/n)? y

       You need	a User-ID to identify your key;	the software constructs	the user id
       from Real Name, Comment and Email Address in this form:
	   "Heinrich Heine (Der	Dichter) (heinrichh@duesseldorf.de)"

       Real name: amandabackup
       Email address:
       Comment:	gpg keys for amandabackup
       You selected this USER-ID:
	   "amandabackup (gpg keys for amandabackup)"

       Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o
       You need	a Passphrase to	protect	your secret key.

       We need to generate a lot of random bytes. It is	a good idea to perform
       some other action (type on the keyboard,	move the mouse,	utilize	the
       disks) during the prime generation; this	gives the random number
       generator a better chance to gain enough	entropy.

       We need to generate a lot of random bytes. It is	a good idea to perform
       some other action (type on the keyboard,	move the mouse,	utilize	the
       disks) during the prime generation; this	gives the random number
       generator a better chance to gain enough	entropy.

       public and secret key created and signed.
       key marked as ultimately	trusted.

       pub  1024D/4417A8CB 2006-02-07 amandabackup (gpg	keys for amandabackup)
	    Key	fingerprint = 139C 6369	44FC 7F1A 655C	E5E9 7EAA 515A 4417 A8CB
       sub  1024g/8C3A6A78 2006-02-07 [expires:	2006-08-06]

FILES
       $AMANDA_HOME/.gnupg/pubring.gpg
	   The public key.  amgpgcrypt encrypt data with this public key along
	   with	the cipher algorithm.

       $AMANDA_HOME/.gnupg/secring.gpg
	   The private/secret key. It's	only needed during
	   amrecover/amrestore.	Store and protect it properly during other
	   time.

       $AMANDA_HOME/.am_passphrase
	   The passphrase. It's	only needed during amrecover/amrestore.	Store
	   and protect it properly during other	time.

BUGS
       Amanda has problem with gpg mdc(modification detection code) in the
       binary mode.  amgpgcrypt	calls gpg with mdc disabled

SEE ALSO
       amanda(8), amanda.conf(5), amcrypt(8), amrestore(8), gpg(1)

       The Amanda Wiki:	: http://wiki.zmanda.com/

AUTHOR
       Kevin Till <kevin.till@zmanda.com>
	   Zmanda, Inc.	(http://www.zmanda.com)

Amanda 3.3.9			  02/09/2016			 AMGPGCRYPT(8)

NAME | SYNOPSIS | DESCRIPTION | KEY AND PASSPHRASE | HOW TO CREATE ENCRYPTION KEYS AND PASSPHRASE FOR AMGPGCRYPT | FILES | BUGS | SEE ALSO | AUTHOR

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