> You can easily brute-force even the worst of all siphash in under 4min You assume that you know the seed or can directly observe the output, which is rare in

> You can easily brute-force even the worst of all siphash in under 4min You assume that you know the seed or can directly observe the output, which is rare in practice. > upper bits of a hash function are always superior to the lower bits Why is that? The identity hash for ints is quite common. And for good hashes, the difference should be negligible.