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Bloom filters have been very interesting in networking because they enable the high speed, low cost implementation of various hardware algorithms. The paper introduces the idea of variable-length signatures, as opposed to the current practice of using fixed-length signatures. This idea naturally enables Bloom filters to perform flow deletions, a well-known problem with standard Bloom filters. Other uses of this idea are also presented and explored. A second contribution of the paper is the use of a bank of Bloom filters to identify the action that must be applied to the packets of a flow, or to dynamically record the state a flow is in.
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