What HTTPS does
HTTPS encrypts the connection between the browser and website. It does not guarantee that content is trustworthy or that the website application has no vulnerabilities.
Certificate warnings
Do not bypass a browser security warning to submit credentials. Record the address, warning and time, then contact support through a trusted route.
Credentials and access
Use unique passwords and stronger authentication where available. Do not share passwords in ordinary enquiry forms.
If you suspect compromise
Preserve useful error information without circulating sensitive logs. Contact support and agree an appropriate investigation and recovery scope.