Self-signed certificates are mostly used internally within labs or business environments where the certificates are created by a person or company and not a trusted third-party.

These certificates, although not created by trusted third party certificate authority (CA), it has the same level of encryption as trusted certificates.

Certificates that are self-signed that are being used to protect a resource will display warning in all web browsers that the certificate can’t be trusted.

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How to Create Self-Signed SSL Certificates on Ubuntu 20.04 | 18.04
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