Data --> Paper and back for Linux

Bruce Ferrell bferrell at
Tue May 27 23:54:21 UTC 2008

and a bit more code

Caleb Marcus wrote:
> 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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