How to unpack a .cer file?

M

my lord2021-03-23 22:21:29

Digital certificates

my lord, 2021-03-23 22:21:29

Please tag me!
My question is how to open a certificate (file with .cer extension)? How to change its author/year etc?

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2 answer(s)

V

Vladimir, 2021-03-24
@SibUrsus

How to change its author/year etc?

No way. Reissue only. I suspect you need to read the basics. For example. Very well written, read all parts.
upd
4th part, the most important for you, so that you no longer ask such questions, for some reason it is closed on Habré, so here is a separate link to it https://eos.ru/eos_products/eos_karma/EP4.pdf

G

galaxy, 2021-03-24
@galaxy

how to open a certificate (file with .cer extension)?

On Windows, double-click.
On *nix, for example, using openssl:

openssl x509 -inform pem -in cerfile.cer -noout -text
# или, в зависимости от формата
openssl x509 -inform der -in cerfile.cer -noout -text

How to change its author/year etc?

No way, otherwise what would be the point in certificates?
All information in it is signed with the key of the certification authority that issued it.