.htaccess AuthConfig

Create .hpasswd file for users (you have to enter a password):

htpasswd -c /usr/lib/cgi-bin/.htusers USER

To add other users:

htpasswd /usr/lib/cgi-bin/.htusers USER2

.htacess File in your public folder

AuthType Basic
AuthName "MY PRIVATE PAGE"
AuthUserFile /usr/lib/cgi-bin/.htusers
Require user MYUSER

Allow apache Server to override AuthConfig

vi /etc/apache2/sites-available/default
....
<Directory "/usr/lib/cgi-bin">
                AllowOverride AuthConfig
....