SipHash and HalfSipHash Added to Linux Kernel

Re:SipHash and HalfSipHash Added to Linux Kernel by anilgulecha on Tuesday January 10, 2017 @08:27AM (#13364585)

> Here's a problem. If an attacker knows the hash function, she can produce many strings that will give the same number in return.

I may be misunderstanding you, but isn't the point of a (good) cryptographic hash function that you cannot produce the multiple plaintext which will give the same value, despite knowing the hash function?

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Re:SipHash and HalfSipHash Added to Linux Kernel by majke on Tuesday January 10, 2017 @08:34AM (#13364618)

In practice you take X lower bits of the hash value. For example 10 bits if the hash table size is 1024. It's trivial to find many input stings which hash(string) % 1024 == fixed value, for any, even best cryptographic hash function.

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