Cuckoo bloom filter

A membership identification is a key functionality in many network applications. Various data structures have been introduced in order to support the efficient membership identification. Since a Bloom filter can provide simple but efficient membership checking, it is widely used in many network applications. However, the query results of Bloom filters can have false positives, which can degrade the search performance. Thus, reducing false positives of Bloom filters is challenging. In order to reduce the false positive rate, this paper proposes to use two sets of hash functions: primary and secondary. When the cell referenced by the primary hash function is occupied, the value of that cell is relocated to a cell referenced by the secondary hash functions like in the cuckoo hash. The proposed structure is evaluated using various sets, and the simulation results show that the proposed scheme can reduce the false positive rates.