Tableau Bridge applies the following security designs:
- All communication is initiated from behind the on-premises firewall and therefore does not require you to manage additional exceptions.
- Data in transit, to and from Tableau Bridge, is encrypted.
- Database credentials are stored on the computer using Windows credentials manager.
Data, to and from the Tableau Bridge client, is transmitted by a TLS 1.2 connection.
For more information, please go through the article Expand Data Freshness Options by Using Tableau Bridge - Tableau
I hope this helps.