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Full Discussion: GnuPG Syntax Help
Top Forums Shell Programming and Scripting GnuPG Syntax Help Post 302801119 by Korn0474 on Wednesday 1st of May 2013 11:04:26 AM
Old 05-01-2013
GnuPG Syntax Help
Hi all,

I'm trying to decrypt a GnuPG file but not having much luck. I'm new to using it and have tried 4 different ways to do it but nothing works. Here are examples of the attempts I have made:
Code:
gpg -o ./file_name.tar.Z --passphrase-fd 0 ./file_name.tar.Z.gpg 0<./password.txt

Code:
cat ./password.txt | gpg --passphrase-fd 0 --output ./file_name.tar.Z --decrypt ./file_name.tar.Z.gpg

Code:
cat ./password.txt|gpg --output ./file_name.tar.Z --batch --passphrase-fd 0 --decrypt ./file_name.tar.Z.gpg

Code:
echo [passphrase text]|gpg --output ./file_name.tar.Z --batch --passphrase-fd 0 --decrypt ./file_name.tar.Z.gpg

In every case this is the error message I recieve back:
Code:
gpg: encrypted with ELG-E key, ID
gpg: decryption failed: secret key not available

which I don't understand because the secret key has been given, either by the password.txt or via the echo statement, and I've been assured that the passphrase is correct so unless I'm being lied to I must be doing something wrong yes?

Thanks in advance for any help provided.
 

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LEARN ABOUT CENTOS

amcrypt

AMCRYPT(8)						  System Administration Commands						AMCRYPT(8)

NAME

       amcrypt - reference crypt program for Amanda symmetric data encryption

SYNOPSIS

       amcrypt

DESCRIPTION

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

       amcrypt will search for the aespipe program in the following directories: /usr/bin:/usr/local/bin:/sbin:/usr/sbin.

       amcrypt calls amaespipe 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)

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

AUTHOR

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

Amanda 3.3.3							    01/10/2013								AMCRYPT(8)
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