BHNT67/Paperback

• "I am looking for a tool that to export a GPG private key to a Data Matrix 2d barcode for long-term archival"

TPK Archival https://www.mail-archive.com/gnupg-users@gnupg.org/msg10826.html

• "Paper is a safe way to backup a secret key: ... If you want to store your GnuPG secret key on a paper sheet, it is quite simple to do."

HOWTO Backup your GnuPG secret key on paper · /dev/schnouki https://schnouki.net/posts/2010/03/22/howto-backup-your-gnupg-secret-key-on-paper/

• Paper SSH & GPG key backups | piggott.me.uk (201505)

https://www.dhpiggott.net/2015/05/20/paper-ssh-gpg-key-backups/

• QR codes for backup? (~2012)

http://blog.liw.fi/posts/qr-backup/

• Generating QR Codes in Linux » Linux Magazine (201308)

http://www.linux-magazine.com/Online/Features/Generating-QR-Codes-in-Linux

• Grant Trebbin: Simple Data Backup with Paper Based QR Codes (201505)

http://www.grant-trebbin.com/2015/05/encode-and-decode-file-backed-up-as.html

• paperbank: Bitcoin Paper Key generator - using a thermal USB printer and a basic linux box (like a Rrasp. PI) - Paper Wallet Generator (201602)

https://github.com/makevoid/paperbank

• Cryptographi: Piper: A bitcoin hardware paper wallet printer (stopped selling it in 201609)

https://cryptographi.com/pages/support

• PaperBack (2007-2013; Windows)

http://ollydbg.de/Paperbak/

• Making Computer Backups - On Paper?! (200907) | Youtube

https://www.youtube.com/watch?v=Q6UctIrZuz4

• Paperbak lets you back up your files onto paper…yes paper! [Freeware] | The Red Ferret Journal (201208)

https://www.redferret.net/?p=33146

• A paper-based backup solution (not as stupid as it sounds) | ExtremeTech (201208)

https://www.extremetech.com/extreme/134427-a-paper-based-backup-solution-not-as-stupid-as-it-sounds#disqus_thread

• Meine Geschichte über Rechenhilfsmittel: Die Computerzeitschriften der 1970er Jahre enthielten oft seitenlange Listings, die recht mühsam abgetippt werden mussten. Die Zeitschrift mc - Magazin für Computerpraxis wollte hier Abhilfe schaffen und entwickelte die mc-Paperdisk. (201302)

http://www.peterkernwein.de/Rechengeraete-Sammlung/paperdisk.htm

• dvdisaster: dvdisaster is a computer program aimed to enhance data survivability on optical discs by creating error detection and correction data, which is used for data recovery. dvdisaster works exclusively at the (iso) image level.

http://dvdisaster.net/de/download.html (dead page, 201901) | Manual (from archive.org)

https://www.heise.de/download/product/dvdisaster-22039

https://en.wikipedia.org/wiki/Dvdisaster

https://github.com/lrq3000/dvdisaster

• PaperBack: Backing up on… paper? | ITProPortal.com

https://www.itproportal.com/2012/08/15/paperback-backing-up-on-paper/ (201208)

• Optar stands for OPTical ARchiver. It's a codec for encoding data on paper or free software 2D barcode in other words. Optar fits 200kB on an A4 page, then you print it with a laser printer. If you want to read the recording, scan it with a scanner and feed into the decoder program. A practical level of reliability is ensured using forward error correction code (FEC). Automated processing of page batches facilitates storage of files larger than 200kB. (2016?)

http://ronja.twibright.com/optar/

• paperbak (memo)

https://pads.ccc.de/*

Hier ist unser Pad für PaperBak und Co., begonnen am 04.11.2015
(helle Farben sind besser)

Links:
 * https://startpage.com/do/search?q=Long-term+archiving+of+digital+data+on+microfilm&lui=deutsch&l=deutsch
 * http://publik.tuwien.ac.at/files/PubDat_191964.pdf Long-term archiving of digital data on microfilm (2010)
 * 
 * 

Woher hats du zbarimng 
hatte Dir berichtet, dass mein build von github nicht ging. 

https://github.com/ZBar/ZBar

./configure 
configure: loading site script /usr/share/site/x86_64-unknown-linux-gnu 
configure: error: cannot find install-sh, install.sh, or shtool in  config "."/config 
Dann habe ich von software.opensuse.org "zbar" geladen, das enthält zbarimg 

und dmtxwrite? Sind die in irgendwelchen standard-suse-paketen dabei oder hast du diese selbstgebaut? https://github.com/dmtx/dmtx-utils

ich habe mich mit QR- und Datamatrix beschäftigt. Gebe jetzt erstmal auf. Anbei ein Testprogramm, darin habe ich meine bisher gefundenen Probleme aufgeführt.
      
Vielleicht weißt Du Rat. Eigentlich bin ich jetzt ganz scharf, ein vernünftiges Verfahren zu haben.
      
Übrigens: Die Datendichte mit QR oder DMTX ist nicht so hoch wie bei Paperbak... das Thema legen wir erstmal zur Seite.

"If you have a good laser printer with the 600 dpi resolution,  you can save up to 500,000 bytes of uncompressed data on the single A4/Letter sheet. Integrated packer allows for much better data density - up to 3,000,000+ (three megabytes) of C code per page."
      
      
      #!/bin/bash
      
      # coding and decoding of a file into QR- or Datamatrix-codes
      # codecode.sh <infile>
      
      # Literature / sources:
      # https://www.mail-archive.com/gnupg-users@gnupg.org/msg10827.html
      # https://schnouki.net/posts/2010/03/22/howto-backup-your-gnupg-secret-key-on-paper/
      # https://www.piggott.me.uk/2015/05/20/paper-ssh-gpg-key-backups/
      # http://blog.liw.fi/posts/qr-backup/
      # http://www.grant-trebbin.com/2015/05/encode-and-decode-file-backed-up-as.html
            
      # QR code
      
      qrchunk=1024
      
      split -a 2 -b $qrchunk -d $1 $1.chunk-
      for file in ./$1.chunk-*; do qrencode -8 -l M -o $file.png <       $file; rm $file; done
      montage -label '%f' $1.chunk-*.png -geometry '1x1<' -tile 2x       $1-qr.png
      # 2x3 pro Seite (image)
      # montage -label '%f' $1.chunk-*.png -geometry '1x1<' -tile 2x3       $1-qr.png
      rm $1.chunk-*.png
      
      # QR decode
      zbarimg --raw $(ls $1-qr*.png | sort -n) > $1_qr-decoded
      # Problem 1: $1_qr-decoded != $1
            
      # Datamatrix code
      dmtxchunk=512
      
      split -a 2 -b $dmtxchunk -d $1 $1.chunk-
      for file in ./$1.chunk-*; do dmtxwrite -e 8 $file > $file.png;       rm $file; done
      montage -label '%f' $1.chunk-*.png -geometry '1x1<' -tile 2x       $1-dmtx.png
      # 2x3 pro Seite (image)
      # montage -label '%f' $1.chunk-*.png -geometry '1x1<' -tile 2x3       $1-dmtx.png
      rm $1.chunk-*.png
      
      # Datamatrix decode
      # Problem 2: dmtxread kann nicht mehrere           image files einlesen
        # Problem 3: dmtxread hat auch Probleme, wenn mehrere           (oder zu viele?) Datamatrix-Codes in einem Image sind
      # dmtxread $(ls $1-dmtx*.png | sort -n) > $1_dmtx-decoded