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Yeah, that's what HIBP does. See here: https://www.troyhunt.com/ive-just-launched-pwned-passwords-v...

I really feel Troy has handled HIBP very, very carefully, honestly, and with the utmost transparency so far. He seems to have put in a lot of thought into everything - whether it is rolling out a feature or planning the future of HIBP.

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To clarify for the GP: HIBP sends the first handful of characters of the password hash to the server, not the password itself or even the full hash. The server then returns all of the hashes matching that prefix, and the remainder of the comparison is done client side.

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