Abstract: Peer-to-peer (P2P) systems can be used to share files, telephony, discussion forms, and streaming media. In Anonymity Peer-to-Peer (P2P) networks, many systems try to mask the identities of their users for privacy considerations. Existing anonymity approaches like Onion routing, Tor, Crowd are mainly path-based: peers have to pre-construct an anonymous path before transmission. If any peer leaves then whole path fails. Maintaining and updating such paths is difficult. Rumor Riding (RR) is a lightweight and non-path-based mutual anonymity protocol for decentralized P2P systems. Employing a random walk mechanism, RR takes advantage of lower overhead by mainly using the symmetric cryptographic algorithm. This paper is literature survey of rumor riding with existing systems.