What Is ca-certificates-mono Package

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∟ca-certificates - Linux CA Certificate Package

∟What Is ca-certificates-mono Package

This section describes the 'ca-certificates-mono' package, which installs trusted root CA certificates in JKS format supporting Java applications.

What Is ca-certificates-mono Package? "ca-certificates-mono" is a software package that contains trusted root CA certificates in PEM format provided by Mozilla Foundation.

"ca-certificates-mono" is usually installed as part of the Mono package on most Linux systems like Debian, Ubuntu, and Red Hat distributions. Root CA certificates stored in pem_lib format installed from "ca-certificates-mono" allow Mono (.NET) applications to verify remote server certificate and establish encrypted connections.

To ensure security, it is highly recommended to keep "ca-certificates-java" updated, as Mozilla Foundation periodically adds and removes CA certificates. You can run package update commands as shown below:

# on Ubuntu
herong$ sudo apt install ca-certificates-mono  
...
ca-certificates-mono is already the newest version ...

After installation, trusted root CA certificates will be stored in the /usr/share/.mono/certs/Trust directory as individual DER files for Mono applications to use.

herong$ ls -l /usr/share/.mono/certs/Trust

-rw-r--r-- 1 root root  626 Nov 12 09:48 ski-01B92FEFBF118660F24....cer
-rw-r--r-- 1 root root 1374 Nov 12 09:48 ski-035CAB738187A8CCB0A....cer
-rw-r--r-- 1 root root  947 Nov 12 09:48 ski-03DE503556D14CBB66F....cer
-rw-r--r-- 1 root root 1463 Nov 12 09:48 ski-069A9B1F537DF1F5A4C....cer
-rw-r--r-- 1 root root  848 Nov 12 09:48 ski-071FD2E79CDAC26EA24....cer
...