Hi Budge:
For your item 1, placing an image of a signature in a document does nothing to
render it secure unless you also use a digital signing process.
It is many rears since I used PGP so I don't recall well enough to give you a
primer on the subject. What I would say is that you can sign any document with
PGP but you wouldn't do it inside LO Writer. You would sign the file through
your file explorer invoking the appropriate PGP incantation. This would not
provide any physically visible signature line inside the .odt file but would
provide you a separate 'signature file' which you could sent out with the
signed file and the recipient could then use PGP to check that the file had not
been altered in transit.
The recipient would have to be PGP aware and as you probably know, PGP is
available for all platforms.
The X509 type certification which you would invoke inside Writer requires that
you first get some certification authority to provide you with an X509
certificate. These are the same sorts of certs that https websites use and SSL
data transfers too. You would probably have to buy such a certificate. There
are some free CA's (certification authorities) about. CAcert is one such, open
source authority. See https://www.cacert.org/ You can Google them.
For further help on using signatures with LO, see their help files. One good
place to start is:
https://help.libreoffice.org/7.3/en-US/text/shared/guide/digitalsign_send.html?DbPAR=SHARED#bm_id7430951
It takes time to get into this subject well enough to provide full document
security. Bon courage!!
Philip
On 01/09/2023 10:19, budge wrote:
Hi Philip and thanks for the reply.
I am learning how to use these tools and trying to understand how the various
options for signing and also securing documents. I am using Linux (openSUSE)
for all this but no doubt windows users as addressees will be viewing and
reading.
I have two different objectives:-
1. To insert a signature or rather an image of a signature in the right place in a
document and in adding this signature image, render the document "signed" so
that it cannot be altered without warnings or better.
2. To secure a document so that is cannot be read or amended by an
unauthorised and, even if read by an unauthorised person, cannot be altered.
I can use PGP type encryption on emails etc already either to sign a message or
to encrypt a message using my email client but am trying to work out how to do
this with a LO document or spreadsheet which may need to be converted into a
pdf.
Is there a simple step by step guide for this?
If I wish to store my private key for an LO signature will it go to the same
"safe" as my PGP keys or my KeePassXC password manager?
I need to have the signature image which can be used like a "stamp" and added
to any document and there may be issues of scaling the size of the image to suit the
environment in which it is used.
If anybody can shine more light it would be very much appreciated.
Budge.
On 31/08/2023 12:48, Philip Jackson wrote:
On 31/08/2023 12:09, Budge wrote:
I am trying to insert a signature line at the end of a spreadsheet and the text which
appears in the for name and title are much smaller than the font setting for the sheet.
Where is this text font defined and how can I change it. Also the date is not shown
although the date option has been ticked for "show date in signature line."
Please can somebody advise?
Budge
As I understand it, the date is only added when you sign the signature line
with a digital certificate. The creation of a signature line is a separate
activity from the signing of that digital line.
When you insert the signature line, it shows your name and status in an image
box. If you hover over this image box and then right click, the context box
shows at the bottom the option to sign the signature line. In order to do
that, you must have previously created a digital certificate in the form of an
X509 certificate which you save in LO.
hth
Philip
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