How to install Sissa root certificate for Mac (tiger)

a) Install http://www.sissa.it/download/ca/sissa-ca.cer


b) The file is generally saved by default in your-user-name/Downloads
In case you changed your default Downloads directory, you should find the file there.



c) Find the Sissa-ca.cer file and execute it (double click).



d) In the Add Certificates window, in the Keychain drop down list:

• 1) select login if the certificate is only for the login user
  
• 2) select system if the certificate is for all users (you must have privileged permissions).
  

If you select login jump to Item g, otherwise continue

e) In the Add Certificate window click on OK to accept the certificate.

f) Finally:

• 1) write the username with privileged permissions of your laptop in the Name field, ,
  
• 2) write the privileged/administrator password in the Password field,
  
• 3) click on OK to accept the certificate.
  

g) Finally In the Add Certificate window click on OK to accept the certificate.