Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : A survey and taxonomy of distributed certificate authorities in mobile ad hoc networks | Masdari et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 112 EURASIP Journal on . http content 2011 1 112 Wireless Communications and Networking a SpringerOpen Journal REVIEW Open Access A survey and taxonomy of distributed certificate authorities in mobile ad hoc networks 1 2 3 1 Mohammad Masdari Sam Jabbehdari Mohammad Reza Ahmadi Seyyed Mohsen Hashemi Jamshid Bagherzadeh4 and Ahmad Khadem-Zadeh3 Abstract Certificate authorities CAs are the main components of PKI that enable us for providing basic security services in wired networks and Internet. But we cannot use centralized CAs in mobile ad hoc networks MANETs . So many efforts have been made to adapt CA to the special characteristics of MANETs and new concepts such as distributed CAs DCAs have been proposed that distribute the functionality of CA between MANET nodes. In this article we study various proposed DCA schemes for MANET and then classify these schemes according to their internal structures and techniques. Finally we propose the characteristics of an ideal DCA system that can be used to verify the completeness of any DCA scheme. This classification and taxonomy identify the weakness and constraints of each scheme and are very important for designing more secure scalable and high performance DCA systems for MANETs and other networks. Keywords distributed certificate authority threshold cryptography registration authority RA PDCA CA nodes cluster head communication overhead OLSR protocol encryption digital signature A mobile ad hoc network MANET is a set of mobile devices that are connected through wireless links. MANETs have characteristics such as limited bandwidth absence of any fixed central structure and ever changing topologies. Thus implementing strong security services in such environments is very hard and MANETs are highly vulnerable to various security attacks. To solve security problems public key cryptography must be used in .
