amcrypt man page on YellowDog

amcrypt man page on YellowDog

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AMCRYPT(8)							    AMCRYPT(8)

NAME
       amcrypt - reference crypt program for Amanda symmetric data encryption

SYNOPSIS
       amcrypt

DESCRIPTION
       amcrypt	requires  aespipe and gpg to work. Aespipe is available from :
       http://loop-aes.sourceforge.net

       amcrypt will search for the aespipe program in the  following  directo‐
       ries:  /usr/bin:/usr/local/bin:/sbin:/usr/sbin.	 amcrypt  calls	 amae‐
       spipe  and  pass	 the  passphrase  through  file	 descriptor  3.	   The
       passphrase should be stored in ~amanda/.am_passphrase.

HOW TO CREATE ENCRYPTION KEYS FOR AMCRYPT
       1.  Create  65 random encryption keys and encrypt those keys using gpg.
       Reading from /dev/random may take indefinitely long if kernel's	random
       entropy	pool  is  empty.  If  that happens, do some other work on some
       other console (use keyboard, mouse and disks).

       head -c 2925 /dev/random | uuencode -m - | head -n 66 | tail -n	65   |
       gpg --symmetric -a > ~amanda/.gnupg/am_key.gpg

       This  will  ask	for a passphrase. Remember this passphrase as you will
       need it in the next step.

       2. Store the passphrase inside the home-directory  of  the  AMANDA-user
       and protect it with proper permissions:

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

KEY AND PASSPHRASE
       amcrypt uses the same key to encrypt and decrypt data.

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

SEE ALSO
       amanda(8), amanda.conf(5), aespipe(1), amaespipe(8), gpg(1)

								    AMCRYPT(8)

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