Are 512 bit encryption keys even a thing? I thought 256 bits is already for the paranoid, with AES128 being sufficiently secure until quantum computation become

Are 512 bit encryption keys even a thing? I thought 256 bits is already for the paranoid, with AES128 being sufficiently secure until quantum computation becomes feasible. I don't even know a symmetric cipher that uses 512 bit keys. Also, since we are talking about hash functions, keys don't even enter the discussion. Hashing is about making password guessing difficult. The length alone doesn't determine how difficult it is anyway, since there are 48 character passwords in popular wordlists. Just enforce 2fa, use argon2 or similar with a minimum password length of 12 and call it a day.