You could use something similar to the k-anonymity approach from haveibeenpwned: https://blog.cloudflare.com/validating-leaked-passwords-with-k-anonymity/ https

You could use something similar to the k-anonymity approach from haveibeenpwned: https://blog.cloudflare.com/validating-leaked-passwords-with-k-anonymity/ https://blog.cloudflare.com/validating-leaked-passwords-with...