You could take this a step further and make your "horcrux" a short & simple cipher code based on some attributes of the organization instead. It takes a bit lo

You could take this a step further and make your "horcrux" a short & simple cipher code based on some attributes of the organization instead. It takes a bit longer to construct for sites you don't log into often, but when appended to a password/passphrase, it appears to be random across each site. If multiple logins get leaked it's not immediately obvious you're are using the double-blind approach.