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Old 11-18-2012, 02:36 AM   #1
rakrr786
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Encryption using tar bzip gzip and zip


Hi
can any one tell me if i can encrypt a file using tar or tar bzip/gzip or zip command while taking a backup just as i can do with vi
 
Old 11-18-2012, 02:46 AM   #2
Elv13
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you can tar something, encrypt it then compress it using bzip/gzip, or tar something, compress it and encrypt it. According to the tar manpage, it is not supported directly, but based on the way tar and gz/bz2 work, it is simply an other layer in between. You are free to use one of many crypt tools available.
 
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Old 11-18-2012, 03:24 AM   #3
catkin
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Encrypted data should not have any discernible patterns so should not compress well. If that theory is correct, compression followed by encryption should produce a smaller file than encryption followed by compression.
 
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Old 11-18-2012, 04:23 AM   #4
malekmustaq
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Quote:
Originally Posted by rakrr786 View Post
Hi
can any one tell me if i can encrypt a file using tar or tar bzip/gzip or zip command while taking a backup just as i can do with vi

You may want to do this---

Code:
tar czf foo.tar.gz  foo.txt && gpg -c foo.tar.gz
Enter password when prompted.

You may remove the original file or delete them after gpg encrypted file is made. Or include deletion within command:

Code:
tar czf foo.tar.gz foo.txt && gpg -c foo.tar.gz && rm -f foo.txt
this one creates an encrypted archive and removes the unencrypted original.

From thence you may create a script to be envoked when encrypting file.

Hope that helps. Good luck.

Last edited by malekmustaq; 11-18-2012 at 04:24 AM.
 
Old 11-18-2012, 12:26 PM   #5
jefro
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tar cf - /path/to/data | 7z a -si archivename.tar.7z


http://www.commandlinefu.com/command...7z-compression

The post also has some additions useful.


"What others think

some newer versions of tar support the '--lzma' option

LZMA is the same type of compression used by 7zip

This is a cleaner option, though I suppose it is only supported by newer versions of tar which could be a problem...
tar c --lzma /path/to/data > archivename.tar.lzma
Comment by infinull 174 weeks and 4 days ago

According to google, GNU tar supports the lzma option since tar 1.20. Starting in tar 1.22 -J (capital 'j') means --xz and not --lzma.
Comment by bwoodacre 174 weeks and 3 days ago
"
 
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Old 11-19-2012, 09:48 AM   #6
malekmustaq
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Thank you jefro. I did not know that.
My tar version=1.26 the --lzma and -J options are already available. I have tried tarring with lzma, the resulting file cannot be stat by 'fileroller' while the resultant file of -J option is easily handled by the same GUI reader. Both results extracted by the same switch. I observe that --lzma switch is entered only after the file name tar -cf foo.tar.lz foo --lzma.

Thank you again.
 
Old 11-19-2012, 03:07 PM   #7
jefro
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I learn something new everyday here.
 
Old 11-19-2012, 03:24 PM   #8
lleb
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tar the file first like you normally would

Code:
tar cvjf /path/to/tarball.tar.bz2 -X /path/to/excludes.conf /path/of/file/directory/to/tar
note you do not need the excludes.conf, it is just there as an option if you want to tar portions of a directory

to encrypt you can use something as simple as this:

Code:
openssl des3 -a -salt -in /path/to/tarball.tar.bz2 -out /path/to/target/encrypted/tarball.tar.bz2.enc -pass pass:<password_here>
there ya go. do not forget the password or you will never get access to the encrypted tarball again.

you can also use && to combine that into one command line. so it will first make the tarball, then encrypt it.

Code:
 tar cvjf /path/to/tarball.tar.bz2 -X /path/to/excludes.conf /path/of/file/directory/to/tar[ && openssl des3 -a -salt -in /path/to/tarball.tar.bz2 -out /path/to/target/encrypted/tarball.tar.bz2.enc -pass pass:<password_here>
 
  


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