Announcing paperbackup.py to backup keys as QR codes on paper

[Gerd v. Egidy]

> You might consider using a font designed for OCR rather than the current
> font.

I tried to change to OCR-B or Inconsolata 
http://stackoverflow.com/questions/316068/what-is-the-ideal-font-for-ocr

but getting that to work with enscript is not easy, as you have to find and 
install afm and pfb into the correct directories. This goes a lot deeper than 
just installing packages provided by whatever disto you are using.

So I think that this would move the bar for a possible user of paperbackup.py 
higher than I want to.
 
> Additionally, base64 has look-alike characters, and the only checksum is
> for the whole key. So if it says "checksum failed" you've only learned
> that factoid. A checksum per line would be better, so you can say
> "checksum failed in line n".

Can you recommend a tool to create a short checksum (crc32?) for each line? 

Ideally it is a tool or combination of tools already deployed widely, like sed 
and sort I used in paperrestore. This would make the checksums still usable 
even when the source to paperbackup.py isn't available anymore.

Kind regards,

Gerd