[Cryptography] Secret sharing for family members

[John Levine]

In article <alpine.BSF.2.21.9999.2010170900070.91515 at aneurin.horsfall.org>,
Dave Horsfall <dave at horsfall.org> wrote:
>> Others have suggested, for other reasons, going with paper.  Paper, if 
>> reasonably carefully stored, should remain readable for many decades. 
>> Go with acid-free paper and store it in a safety deposit box and it 
>> should be good for many centuries.
>
>I think that "acid-free" paper is also known as green-washing i.e. be seen 
>to be doing something good, whilst not actually doing so.

No, acid-free paper is a standard term for paper that does not
deteriorate as it ages. If you've picked up an old newspaper and had
it crumble, that's due to cheap paper that wasn't treated to remove
the lignin in wood pulp and make it acid-free. Really old newspapers,
from before they started to use wood pulp paper, don't do that.

You also want to use a pigment that won't fade but the toner in most
laser printers is pretty stable.  Some laser printers have an archival
option that slows the printer and increases the fuser temperatre so
the toner bonds better to the paper.

>Yep, just another technology that will fade.  The QR codes that I check on 
>my iPhone from time to time in the shops are usually unreadable.

That's just a matter of printing quality.  See above.



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