On 29C3 djb, Jean-Philippe Aumasson and Martin Boßlet gave a very interesting talk on SipHash (see the video).
In short - SipHash is a new hash, created especially to save you from hash flooding attacks. The hash takes two parameters - a 128 bit "secret" key and an arbitrary data blob. This is different from traditional hashes which required only a data blob as an input. SipHash outputs a secure 64 bit hash.
SipHash is described in detail in the extremely well written paper.
Read full article from SipHash — Idea of the day
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