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Most of the existing trust-based routing schemes require the support of promiscuous mode of operation and gather a large number of recommendations from the neighbors for trust derivation. These result in higher energy consumption, higher communication overhead, and larger memory requirements in a resource constrained sensor network. In this paper, we propose a new two-way acknowledgment-based trust (2-ACKT) framework with individual (2-ACKT-I) and group (2-ACKT-G) acknowledgment to minimize the communication overhead and memory requirement for trust establishment in WSNs. The 2-ACKT protocol calculates the direct trust using a link layer acknowledgment and a two-hop acknowledgment from a downstream neighbor. The simulation and theoretical results indicate that 2-ACKT scheme significantly outperforms the conventional multihop and trust-based routing schemes in terms of packet delivery ratio, network lifetime, communication overhead, and memory requirements. <\/jats:p>","DOI":"10.1155\/2013\/952905","type":"journal-article","created":{"date-parts":[[2013,5,14]],"date-time":"2013-05-14T21:02:59Z","timestamp":1368565379000},"page":"952905","update-policy":"http:\/\/dx.doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":20,"title":["Two-Way Acknowledgment-Based Trust Framework for Wireless Sensor Networks"],"prefix":"10.1177","volume":"9","author":[{"given":"X.","family":"Anita","sequence":"first","affiliation":[{"name":"Department of ECE, Anna University, Chennai 600025, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.","family":"Martin Leo Manickam","sequence":"additional","affiliation":[{"name":"Department of ECE, St. Joseph's College of Engineering, Chennai 600119, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M. 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