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Full Discussion: How to use GPG for myself on Thumb drive?
Top Forums UNIX for Dummies Questions & Answers How to use GPG for myself on Thumb drive? Post 302249725 by siegfried on Wednesday 22nd of October 2008 01:44:14 AM
Old 10-22-2008
How to use GPG for myself on Thumb drive?
I have some sensitive data I would like to keep on a thumb drive.

Now I know this is a UNIX/Linux forum and I regret to say that I'm using windows but I'm hoping that is irrelevant.

So I install gpg on both windows machines: one at home and the other at work.

I encrypt some stuff on the home machine, export the keys and go to work and import the keys. No errors. But then I try to decrypt the data file and no luck: it did not even prompt me for my passphrase!
What do I have to do to be able to read my encrypted file at work?

Also: should I be concerned about piping the decrypted output from gpg to a hard drive where someone at the recycling center could eventually scavenge the disk. I was going to pipe it to the thumb drive but then I realized if I ever lost my thumb drive, someone could scavenge the decrypted deleted file?

So what can I do? Have a special thumb drive just for holding the deleted and decrypted data that I eventually destroy? Or maybe one cannot scavenge flash memory?

Thanks,
Siegfried
 

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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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