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

Robin Wood robin at digi.ninja
Wed Oct 21 13:59:24 EDT 2020

On Tue, 20 Oct 2020, 02:44 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.

I went on a segmentation test once and the first segment the client put me
on was the one shared between guest WiFi users and their big fleet of
printer / scanners.

They were an insurance company and printed cheques on these devices and
scanned all their post on them. Everything was saved locally for a very
long time.

Not great segmentation to start with, made even worse by the fact all
devices had default login creds.

I hope they listened to my advice of rethinking that group but I never went
back to find out.

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