libbloom-filter-perl 1.2-5 (i386 binary) in ubuntu oracular

 A Bloom filter is a probabilistic algorithm for doing existence tests
 in less memory than a full list of keys would require. The tradeoff to
 using Bloom filters is a certain configurable risk of false positives.
 .
 Bloom::Filter is a Perl library implementing a simple Bloom filter with
 configurable capacity and false positive rate.