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How SSL / TLS certificates work

I would like to know how SSL certificates work, specifically I would like to know how the browser certifies that these certificates are valid and signed by a valid certification body, how does it get them safely? Why is it rare for an IoT device to have this capability ?

7th Jan 2022, 12:23 AM
Mick
Mick - avatar
5 Answers
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The browsers have a list of valid certificates, installed and updated with the browser code itself. Plus, it also has a local list, where the user can add his own trusted certificates.
7th Jan 2022, 1:07 AM
Emerson Prado
Emerson Prado - avatar
+ 1
The browser updates already deal with the ones it mantains. If you add certificates manually, then you have to update manually - add the new ones and remove the expired ones.
7th Jan 2022, 10:44 PM
Emerson Prado
Emerson Prado - avatar
0
How do I update other certificates when certificates expire?
7th Jan 2022, 11:02 AM
Mick
Mick - avatar
0
I use Fiddler as a proxy to read my browser traffic, could the certificate I installed could undermine the security on other connections to other servers?
7th Jan 2022, 11:05 PM
Mick
Mick - avatar
0
I don't know Fiddler. But only your browser uses the certificates installed in it - it doesn't affect proxies, even local. Except, obviously, if you install a certificate from a harmful domain which attacks proxies, but I don't think one would do this.
8th Jan 2022, 4:36 AM
Emerson Prado
Emerson Prado - avatar