Christian Heimes added the comment:
Our hash randomization will always leak some information about the
randomization keys. The only way to properly secure our secrets is a
cryptographic secure algorithms, for example a crypto hashing function in
combination with a message authentication code like HMAC. I don't have to
explain how that is going to hurt performance ...
We can try to make it harder to guess the secret parts with a slightly modified
algorithm like e.g. V8's hash but that's never going to be 100% secure. But
might be secure enough to make an attack too hard.
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