Data --> Paper and back for Linux

Caleb Marcus caleb.marcus at
Tue May 27 23:28:24 UTC 2008

Thanks, that's very interesting stuff. However, I'm looking for more of
something that'll print things in a machine-only-readable form... to be
able to fit more data on a page.
On Wed, 2008-05-28 at 07:06 +0800, Sandy Harris wrote:
> On Wed, May 28, 2008 at 6:03 AM, Caleb Marcus <caleb.marcus at> wrote:
> > I'm wondering if there's any software available that will take data,
> > produce an image that can be printed, and allow a scanned version of it
> > to be converted back to data. There's always base64 and OCR, but I'm
> > wondering if there's anything that'll get higher usable density. I'm
> > thinking of making something like this for fun, but it'll be difficult,
> > and it would be nice to look at previously-done examples of it.
> It has been done. US laws forbade export of cryptography source,
> but books are constitutionally protected so PGP developed tools
> for scannable books.
> Discussion and links:
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