One password. For every site!
Now this could sound risky, What if one supplier is hacked and loses your password, this is where authentication authority works, its an authentication portal that you access via your secure access defender login, and uses cryptographically strong passwords for your external sites, which can be changed on an hourly basis.
With all your online credentials changing every few minutes/hours and you authentication into them being totally secure, life for a hacker will suddenly become a nightmare. Which is what we all want.