[Cryptography] Fun with printers, Secret sharing for family members

Phillip Hallam-Baker phill at hallambaker.com
Mon Oct 19 21:50:57 EDT 2020

On Mon, Oct 19, 2020 at 9:43 PM John Levine <johnl at taugh.com> wrote:

> In article <
> 9b3ecf06bc5b7e7eb1b73e746dd88d9708961def.camel at crypto.16bits.net>,
> �ngel <angel at crypto.16bits.net> wrote:
> >> If I'm not mistaken, many modern printers will store the printed
> >> document locally on a disk. ...
> >I think caching may better describe it. Yes, the printer could store
> >the document locally before printing. Later printing would *probably*
> >overwrite it.
> It's true, workgroup printers typically have disks so they can buffer
> print and scan jobs and reorder them and other fancy features.  The
> disks are pretty big, and I wouldn't count on your print job being
> overwritten very soon.
> On the other hand, there's an easy way to avoid this problem: use
> a printer without a disk.  The cheap home printers don't have them.

I designed my system with secrets short enough to be written out by hand
precisely because of these issues.
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