On 01/06/18 18:59, Vinnie Falco via Boost wrote:
I am not familiar with the terms offset and modulo as applied to popular non-cryptographic hash algorithms such as xxHash or
For FNV: s/offset/basis/ s/modulo/prime/ In other words, the constants used withing the hash function.
Some of these algorithms allow the user to provide an integral "seed" which is used to permute the result. This can be used to protect a container from algorithmic complexity attacks when used with possibly adversarial inputs. In the absence of an algorithm which allows for a seed, a less efficient but equally effective method is to prepend a unique value, specific to the instance of the hash function, to the input data. This can be turned into a generic wrapper (I believe Peter will eventually add such a thing if he has not done so already).
Is different seeding sufficient to ensure that they are pairwise independent?