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A group key exchange (GKE) protocol allows that participants cooperatively establish a group key that is used to encrypt and decrypt transmitted messages. Hence, GKE protocols can be used to provide secure group communication over a public network channel. However, most of the previously proposed GKE protocols deployed in wired networks are not fully suitable for wireless network environments with low-power computing devices. Subsequently, several GKE protocols suitable for mobile or wireless networks have been proposed. In this article, we will propose a more efficient group key exchange protocol with dynamic joining and leaving. Under the decision Diffie-Hellman (DDH), the computation Diffie-Hellman (CDH), and the hash function assumptions, we demonstrate that the proposed protocol is secure against passive attack and provides forward\/backward secrecy for dynamic member joining\/leaving. As compared with the recently proposed GKE protocols, our protocol provides better performance in terms of computational cost, round number, and communication cost.<\/jats:p>","DOI":"10.1186\/1687-1499-2011-12","type":"journal-article","created":{"date-parts":[[2011,6,15]],"date-time":"2011-06-15T07:02:42Z","timestamp":1308121362000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Two-round contributory group key exchange protocol for wireless network environments"],"prefix":"10.1186","volume":"2011","author":[{"given":"Tsu-Yang","family":"Wu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuh-Min","family":"Tseng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ching-Wen","family":"Yu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2011,6,14]]},"reference":[{"key":"11_CR1","unstructured":"ANSI\/IEEE. 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