Design of Original Search Model Based on Broadcast and DHT in Peer to Peer Environment

The file retrieval based on key words in P2P network is a challenging problem. In this paper, we propose a new solution: the search model identifies the frequency of key words automatically and applies inverted index based on DHT to fetch the sparse key words, the model can judge adopting whether inverted index or broadcast search under the condition of basing on key words retrieval, when fetch frequent key words, the model improves the broadcast algorithm in P2P system and adopts pointer of DHT to avoid repetitive messages.