Paperkey 1.3

Thomas Harning Jr. harningt at
Fri Jan 4 16:35:30 CET 2013

You may want to check out my blog post about key backup[1]. In it I
mention two bar-code style backup solutions:
 * PaperBack [2]
 * Twibright Optar [3]

I also investigated QR codes and other 2D bar codes.. however they did
not seem to scale well to large amounts of data...

I found that PaperBack, while being a Win32 app (runs fine in Wine)
works beautifully for storing quite a bit of data with redundancy and
handling for user-level printers. Quoting the page "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." ... quite a
bit to store your entire secret keyring ... though you could use
paperkey + this to permit bumping up redundancy / dot-size quite a

Twibright Optar has quite a bit of promise, but requires quite a bit
of pre-processing and noise removal (not to mention source-code edit
to change dot-size to work nicely with non-super printers).


On Fri, Jan 4, 2013 at 4:01 AM, Branko Majic <branko at> wrote:
> On Thu, 3 Jan 2013 23:42:07 -0500
> David Shaw <dshaw at> wrote:
>> Paperkey 1.3 is released.  This adds ECC key support (both ECDH and
>> ECDSA) as well as a few more minor tweaks.
>> Source and Win32 binaries are available at:
> Curious piece of software. Certainly not something that comes to mind
> right away for making backups.
> I wonder if you could back-up even more by using 2D bar code for an
> output?
> Best regards
> --
> Branko Majic
> Jabber: branko at
> Please use only Free formats when sending attachments to me.
> Бранко Мајић
> Џабер: branko at
> Молим вас да додатке шаљете искључиво у слободним форматима.
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Thomas Harning Jr. (

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