> are they slow because they are computationally intensive... In general, no. Most "slow" hashing schemes are designed to be memory-hard and highly serial (mor

> are they slow because they are computationally intensive... In general, no. Most "slow" hashing schemes are designed to be memory-hard and highly serial (more threads = more contention, not throughput). Some of the earlier approaches just try to maximize computational requirements, but modern research acknowledges the march of computing power makes that an inherently poor choice for long term sensitive data. Argon2 is just one of the more advanced versions of a memory-hard scheme, building on prior research. I could try to give a poor explanation, but instead I'll link you the spec which is very readable: https://github.com/P-H-C/phc-winner-argon2/blob/master/argon2-specs.pdf https://github.com/P-H-C/phc-winner-argon2/blob/master/argon...