On Apr 12, 2023, at 14:54, D. Hugh Redelmeier via talk <talk@gtalug.org> wrote:
We don't seem to have a Public Key Infrastructure that makes digital
(cryptographic) signatures useful for non-computer work.
I think signing a document is a solemn act. So I don't want to just paste
a .PNG of my signature, I want to actually sign it.
I don't have a modern Linux device with a stylus. (Somewhere I have a
ThinkPad x61 and a couple of Sharp Zaurus PDAs.)
I do have an iPad and a ThinkPad C13 ChromeBook, both of which have
styli. In each case it is a little intricate so I thought others might
find my methods useful. Suggestions welcome.
On the iPad:
- I can plug in the ipad to a USB port of my desktop and instruct the iPad
to act like an external disk drive
- using Gnome Files, I can transfer the PDF to a directory on the iPad.
- using the file browser on the iPad, I navigate to the PDF, long press on
it, and select "Quick View". I don't want Adobe tools.
- I can just write on the document with the stylus and save it. I usually
save it with a different name, one that indicates that it is a signed
document.
- using Gnome Files, I copy the signed document from the iPad to my
desktop.
- Using Gnome Files, I "eject" the two removable filesystems that are the
iPad's. I can then unplug the iPad
On the Chromebook:
- I have already installed the Linux subsystem. I start up the terminal
in the Linux container.
- I use scp to copy the PDF from the desktop to ChromeBook's Linux
filesystem (my home directory)
- I use the ChromeOS Files application to open the PDF file (the Linux
container's filesystem is visible to Files).
- I tap a snake-like symbol on the top of the screen (It seems to signify
scribbling).
- I write my signature
- I save the result, with a distinct name, in the Linux Container
filesystem
- back in the terminal, I issue the scp with the arguments suitably
adjusted (easy to type with bash's history mechanism).
I find the ChromeBook a bit easier. Partly because WiFi is easier than
wiring (I have only one lightening cable and it is usually hooked up to a
charger). If I found an iOS SCP application that might even the
platforms.
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