1

It is generally recommended that one use a slow hash function to hash passwords. However, does this create a DoS risk?

2

You could, in addition to using a slow hash function, limit the number of requests per second a particular user could send. For instance, if you're getting 30 failed login requests from a particular IP address, then you could delay the responses to that address, or drop them all together.

Slowing hash functions is designed to make it impractical to carry out a brute force attack if an attacker gets access to the password database. There should still be precautions built into the server as well.

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