Reauthentication and user audit every time the field is accessed.
Copy / Show / Change
Precisely define who can access, change and copy field value.
Set Your Own Key
You can store the key off your Jira server to increase security.
How does it work?
The Password Field stores passwords behind a secure mask (like in this e****le) and requires reauthentication when a user tries to show, copy or edit the field's value.
Moreover, every access attempt is recorded and auditable in the field's history, so you can precisely tell who has (for example) copied the value of the field or tried to unsuccessfully access it.
Create Password Custom Field, Reauthenticate and Audit Access
To increase security, you can set your own Encryption Key and store it outside of your Jira server, so not even system administrator can access it.
Depending on search setting, the users will either be blocked from searching for passwords, or will only know the date of last modification (e.g. to check which password has expired).
Set Your Own Encryption Key, Manage JQL Search Settings