How to use .cer on Linux

This article explains the instructions to use <windows>.cer file on Linux (ex. Ubuntu, Debian, etc.)

1. Convert .cer to .pem
   • sudo openssl x509 -inform PEM -in <file>.cer -out <file>.pem
2. Convert .pem to .crt
   • sudo openssl x509 -inform PEM -in <file>.pem -out <file>.crt
3. Change privileged file access.
   • sudo chmod 755 <file>.crt
4. Copy to ca-certification folder
   • sudo cp <file>.crt /etc/ssl/certs/
   • OR
   • sudo cp <file>.crt /usr/local/share/ca-certificates/
5. Update system ca-certification
   • sudo update-ca-certificates

By EmOne