Compression of View on Anonymous Networks—Folded View—

View is a labeled directed graph containing all information about the network that a party can learn by exchanging messages with its neighbors. View can be used to solve distributed problems on an anonymous network (i.e., a network that does not guarantee that every party has a unique identifier). This paper presents an algorithm that constructs views in a compressed form on an anonymous n-party network of any topology in at most 2n rounds with O(n⁶log n) bit complexity, where the time complexity (i.e., the number of local computation steps per party) is O(n⁶log n). This is the first view-construction algorithm that runs in O(n) rounds with polynomial bits complexity. The paper also gives an algorithm that counts the number of nonisomorphic views in the network in O(n⁶log n) time complexity if a view is given in the compressed form. These algorithms imply that some well-studied problems, including the leader election problem, can deterministically be solved in O(n) rounds with polynomial bit and time complexity on an anonymous n-party network of any topology.