Re: question on hash for long strings

[Andrea <andrea.l.vitali@...>]

Anything that sub-sample the string in a predictable way makes it very easy to generate collisions: just use characters that are not hashed 

So sub-sampling should not be there or  sub-sampling must not be predictable looking at the code 

For Max security one should not be able to predict the hash of a new string based on previous strings and their hashes - use a keyed hash such as Siphash which is in fact adopted by many 

But you can do this in your Lua installation 

    Andrea 

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Andrea Vitali