Printing Keys and using OCR.
groups at caseyljones.net
Fri May 18 19:29:59 CEST 2007
James Cloos wrote:
> Use the OCRA font. I did that in the past scaled so that the key used
> up most of a single letter sized sheet of paper. I probably used mpage¹
> or enscript² to do the conversion to PostScript (it has been a while :).
> CTAN has metafont versions of OCRA and OCRB if you use TeX.
> You can get Type1 and TTF versions of OCRA from the ocr-a-font³ project
> on sourceforge.
> 3) http://sourceforge.net/projects/ocr-a-font
I got the the OCRA.ttf font from this link but it doesn't have the + - /
and = characters used it the ascii ouptput of gpg. Do the fonts from
CTAN have those chars. OCRA.ttf has a few other symbols. We could
replace the + - / and = chars with the symbols in the OCRA.ttf font
before printing. Perhaps also replace the lowercase L and the one and
the zero and the uppercase O.
At first I was thinking that printing the keys in an ascii format would
be superior to a barcode because it would be human readable(at least
readable enough to retype), but then I realized that it wouldn't take
much damage to the paper to render it unrecoverable. Barcodes are more
resilient. But they're not human readable. Maybe the way to go is to use
both. Or maybe we should create something like base64 but with error
correction chars in both the horizontal and vertical direction. Or maybe
we should just print multiple copies. Or maybe print in base16, though
we'd still need/want error correction.
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