Trusted root certificates are used by a computer or device for secure communications and file/program authentication.

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58
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9answers
24k views

Why won't OS X trust GitHub's SSL certificate?

When I go to any github.com page in Chrome, I get a big ugly error: You attempted to reach github.com, but the server presented a certificate issued by an entity that is not trusted by your ...
26
votes
4answers
48k views

How do you add a certificate authority (CA) to Ubuntu?

My work has decided to issue their own certificate authority (CA) to handle different aspects of our work securely without paying for certificates. Cryptographically sign emails Encrypt email ...
4
votes
2answers
722 views

Where to get certificates for Acrobat PDF

When sending an invoice in PDF format, it is useful (in some countries obligatory) to sign this PDF digitally. Of course, I could create a self-signed certificate via OpenSSL, but a warning "could ...