This document discusses content-based publish/subscribe systems and Bloom filters. It introduces B-SUB, a Bloom filter-based publish-subscribe system that uses temporal counting Bloom filters (TCBFs) to encode user interests and propagate them between brokers. TCBFs allow brokers to make forwarding decisions by querying the filters and decay interests over time using an adjustable decaying factor. The document outlines the components of B-SUB, how Bloom filters and TCBFs work, problems with TCBFs like false positives, and how the decaying factor helps adjust B-SUB's behavior.