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[Question] Is this a secure way to generate passwords
(sh.itjust.works)
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Why not use the Yubikey for the master password on a KeePass DB (or another password manager) and then use actual different passwords—not just prefixed ones—saved in said password manager for your logins?
It doesn't matter if your base password is a 255 character high-entropy annoying-to-type-manually-on-a-phone-keyboard or a 16 character string of alphanumeric characters if you reuse it in a slightly predictable manner. For it to be somewhat secure, the prefix would have to be completely random, which kinda defeats the idea of you being able to remember them. A "base password" is, to be frank, only one small step up from using the same password everywhere.
And as someone else pointed out, it makes it very difficult to change passwords, which also should be a huge red flag.
Take a look at the leaks on Have I Been Pwned and see how many of them include either clear text passwords or extremely weakly hashed (perhaps even unsalted) passwords. If you show up in just one or two of those, then you're in a significantly worse position than you would be had you just used different passwords.