You can set up Apache with SSL (HTTPS) as a front end to Artifactory using the HTTP protocol.
Client ----------> HTTPD ----------> Artifactory
HTTPS HTTPSet SSL/TLS on Apache
<VirtualHost *:443>
SSLEngine on
SSLCertificateFile path/to/yourdomain.com.crt
SSLCertificateKeyFile path/to/yourdomain.com.key
SSLProxyEngine on
## Additional reverse proxy directives
</VirtualHost>