Data --> Paper and back for Linux

[Sandy Harris]

On Wed, May 28, 2008 at 6:03 AM, Caleb Marcus <caleb.marcus at gmail.com> 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:
http://www.mirrors.wiretapped.net/security/cryptography/literature/cracking-des/chap-4.html



-- 
Sandy Harris,
Nanjing, China