Uploaded October 2024 | Updated September 2026, 2 weeks ago

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How To Install Root Certificate Authority (CA) in Linux

Certificate authorities (CAs) are critical in securing online communications and identities.
A certificate authority is a company or organization that acts to validate the identities of entities (such as websites, email addresses, companies, or individual persons) and bind them to cryptographic keys through the issuance of electronic documents known as digital certificates.

A digital certificate provides:
- Authentication, by serving as a credential to validate the identity of the entity that it is issued to.
- Encryption, for secure communication over insecure networks such as the internet.
- Integrity of documents signed with the certificate so that they cannot be altered by a third party in transit.

These certificates allow secure, encrypted communication between two parties through public key cryptography.


Given a CA certificate file foo.crt, follow these steps to install it on Linux:
- Create a directory for extra CA certificates in /usr/local/share/ca-certificates:
sudo mkdir /usr/local/share/ca-certificates/extra

- Copy the CA .crt file to this directory:
sudo cp foo.crt /usr/local/share/ca-certificates/extra/foo.crt

- Let Linux add the .crt file's path relative to /usr/local/share/ca-certificates to /etc/ca-certificates.conf:
sudo dpkg-reconfigure ca-certificates

- In case of a .pem file on Ubuntu, it must first be converted to a .crt file:
openssl x509 -in foo.pem -inform PEM -out foo.crt

- Or a .cer file can be converted to a .crt file:
openssl x509 -inform DER -in foo.cer -out foo.crt













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#sslcertificate #certificate #linux