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by IncreasePosts 623 days ago
Clearly "Y" is just the password as my server sees it

But, by not sending the actual user-entered password, it prevents me from logging the user-entered password in plaintext.

If I did make a mistake and logged the users email and "Y", and I got hacked, the hacker could not take the email and "Y" and try to log into a variety of other online services using the same credentials. This is the credential stuffing I was speaking of.