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2018 Hindawi Mathematical Problems in Engineering Security and Privacy Protection of Social Networks in Big Data Era Lead Guest Editor: Lixiang Li Guest Editors: Zonghua Zhang, Kaoru Ota, and Liu Yuhong Security and Privacy Protection of Social Networks in Big Data Era Mathematical Problems in Engineering Security and Privacy Protection of Social Networks in Big Data Era Lead Guest Editor: Lixiang Li Guest Editors: Zonghua Zhang, Kaoru Ota, and Liu Yuhong Copyright © 2018 Hindawi. All rights reserved. This is a special issue published in “Mathematical Problems in Engineering.” All articles are open access articles distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Editorial Board Mohamed Abd El Aziz, Egypt Alberto Borboni, Italy Andrea Crivellini, Italy José Ángel Acosta, Spain Paolo Boscariol, Italy Erik Cuevas, Mexico Paolo Addesso, Italy Daniela Boso, Italy Peter Dabnichki, Australia Claudia Adduce, Italy Guillermo Botella-Juan, Spain Luca D’Acierno, Italy Ramesh Agarwal, USA Fabio Bovenga, Italy Weizhong Dai, USA Juan C. Agüero, Australia Francesco Braghin, Italy Andrea Dall’Asta, Italy R Aguilar-López, Mexico Maurizio Brocchini, Italy Purushothaman Damodaran, USA Tarek Ahmed-Ali, France Julien Bruchon, France Farhang Daneshmand, Canada Muhammad N. Akram, Norway Matteo Bruggi, Italy Fabio De Angelis, Italy Guido Ala, Italy Michele Brun, Italy Pietro De Lellis, Italy Mohammad-Reza Alam, USA Tito Busani, USA Stefano de Miranda, Italy Salvatore Alfonzetti, Italy Raquel Caballero-Águila, Spain Filippo de Monte, Italy Mohammad D. Aliyu, Canada Filippo Cacace, Italy Maria do Rosário de Pinho, Portugal Juan A. Almendral, Spain Pierfrancesco Cacciola, UK Michael Defoort, France Lionel Amodeo, France Salvatore Caddemi, Italy Xavier Delorme, France Sebastian Anita, Romania Salvatore Cannella, Italy Angelo Di Egidio, Italy Renata Archetti, Italy Javier Cara, Spain RamónI.Diego,Spain Felice Arena, Italy Ana Carpio, Spain Yannis Dimakopoulos, Greece Sabri Arik, Turkey Federica Caselli, Italy Zhengtao Ding, UK Alessandro Arsie, USA Carmen Castillo, Spain M. Djemai, France Edoardo Artioli, Italy Inmaculada T. Castro, Spain Alexandre B. Dolgui, France Fumihiro Ashida, Japan Gabriele Cazzulani, Italy Florent Duchaine, France Mohsen Asle Zaeem, USA Luis Cea, Spain George S. Dulikravich, USA Romain Aubry, USA Miguel Cerrolaza, Venezuela Bogdan Dumitrescu, Romania Matteo Aureli, USA M. Chadli, France Horst Ecker, Austria Viktor Avrutin, Germany Gregory Chagnon, France Ahmed El Hajjaji, France Francesco Aymerich, Italy Ludovic Chamoin, France Fouad Erchiqui, Canada Seungik Baek, USA Ching-Ter Chang, Taiwan Anders Eriksson, Sweden Khaled Bahlali, France Michael J. Chappell, UK R. Emre Erkmen, Australia Laurent Bako, France Kacem Chehdi, France Andrea L. Facci, Italy Stefan Balint, Romania Peter N. Cheimets, USA Giovanni Falsone, Italy Alfonso Banos, Spain Xinkai Chen, Japan Hua Fan, China Roberto Baratti, Italy Francisco Chicano, Spain Yann Favennec, France Azeddine Beghdadi, France Hung-Yuan Chung, Taiwan Fiorenzo A. Fazzolari, UK Denis Benasciutti, Italy Simone Cinquemani, Italy Giuseppe Fedele, Italy Ivano Benedetti, Italy Joaquim Ciurana, Spain Roberto Fedele, Italy Elena Benvenuti, Italy John D. Clayton, USA Jesus M. Fernandez Oro, Spain Michele Betti, Italy Giuseppina Colicchio, Italy Francesco Ferrise, Italy Jean-Charles Beugnot, France Mario Cools, Belgium Eric Feulvarch, France Simone Bianco, Italy Sara Coppola, Italy Barak Fishbain, Israel Gennaro N. Bifulco, Italy Jean-Pierre Corriou, France Simme Douwe Flapper, Netherlands David Bigaud, France J.-C. Cortés, Spain Thierry Floquet, France Antonio Bilotta, Italy Carlo Cosentino, Italy Eric Florentin, France Paul Bogdan, USA Paolo Crippa, Italy Francesco Franco, Italy Elisa Francomano, Italy Asier Ibeas, Spain Jean Jacques Loiseau, France Tomonari Furukawa, USA OrestV.Iftime,Netherlands Paolo Lonetti, Italy Mohamed Gadala, Canada Giacomo Innocenti, Italy Sandro Longo, Italy Matteo Gaeta, Italy Emilio Insfran Pelozo, Spain Sebastian López, Spain Mauro Gaggero, Italy Nazrul Islam, USA Luis M. López-Ochoa, Spain Zoran Gajic, Iraq Benoit Iung, France Vassilios C. Loukopoulos, Greece Erez Gal, Israel Benjamin Ivorra, Spain Valentin Lychagin, Norway Ugo Galvanetto, Italy Payman Jalali, Finland Emilio Jiménez Macías, Spain Akemi Gálvez, Spain Reza Jazar, Australia Antonio Madeo, Italy Rita Gamberini, Italy Khalide Jbilou, France José María Maestre, Spain Maria L. Gandarias, Spain Linni Jian, China FazalM.Mahomed,SouthAfrica Arman Ganji, Canada Bin Jiang, China Noureddine Manamanni, France Zhong-Ke Gao, China Zhongping Jiang, USA Didier Maquin, France Giovanni Garcea, Italy Ningde Jin, China Giuseppe Carlo Marano, Italy Jose M. Garcia-Aznar, Spain Dylan F. Jones, UK Damijan Markovic, France Alessandro Gasparetto, Italy Tamas Kalmar-Nagy, Hungary Francesco Marotti de Sciarra, Italy Oleg V. Gendelman, Israel Tomasz Kapitaniak, Poland Rodrigo Martinez-Bejar, Spain Mergen H. Ghayesh, Australia Julius Kaplunov, UK Benoit Marx, France Agathoklis Giaralis, UK Haranath Kar, India Franck Massa, France Anna M. Gil-Lafuente, Spain Konstantinos Karamanos, Belgium Paolo Massioni, France Ivan Giorgio, Italy Jean-Pierre Kenne, Canada Alessandro Mauro, Italy Alessio Gizzi, Italy Chaudry M. Khalique, South Africa Fabio Mazza, Italy David González, Spain Do Wan Kim, Republic of Korea Driss Mehdi, France Rama S. R. Gorla, USA Nam-Il Kim, Republic of Korea Roderick Melnik, Canada Oded Gottlieb, Israel Manfred Krafczyk, Germany Pasquale Memmolo, Italy Nicolas Gourdain, France Frederic Kratz, France Xiangyu Meng, USA Kannan Govindan, Denmark Petr Krysl, USA Jose Merodio, Spain Antoine Grall, France Jurgen Kurths, Germany Alessio Merola, Italy Fabrizio Greco, Italy Kyandoghere Kyamakya, Austria Luciano Mescia, Italy Jason Gu, Canada Davide La Torre, Italy Laurent Mevel, France Federico Guarracino, Italy Risto Lahdelma, Finland Yuri Vladimirovich Mikhlin, Ukraine José L. Guzmán, Spain Hak-Keung Lam, UK Aki Mikkola, Finland Quang Phuc Ha, Australia Jimmy Lauber, France Hiroyuki Mino, Japan Zhen-Lai Han, China Antonino Laudani, Italy Pablo Mira, Spain Thomas Hanne, Switzerland Aimé Lay-Ekuakille, Italy Vito Mocella, Italy Xiao-Qiao He, China Nicolas J. Leconte, France Roberto Montanini, Italy Sebastian Heidenreich, Germany Marek Lefik, Poland Gisele Mophou, France Luca Heltai, Italy Yaguo L ei, China Rafael Morales, Spain Alfredo G. Hernández-Diaz, Spain Thibault Lemaire, France Marco Morandini, Italy M.I. Herreros, Spain Stefano Lenci, Italy Simone Morganti, Italy Eckhard Hitzer, Japan Roman Lewandowski, Poland Aziz Moukrim, France Paul Honeine, France Panos Liatsis, UAE Emiliano Mucchi, Italy Jaromir Horacek, Czech Republic Anatoly Lisnianski, Israel Josefa Mula, Spain Muneo Hori, Japan Peide Liu, China Jose J. Muñoz, Spain András Horváth, Italy Peter Liu, Taiwan Giuseppe Muscolino, Italy Gordon Huang, Canada Wanquan Liu, Australia Marco Mussetta, Italy Sajid Hussain, Canada Alessandro Lo Schiavo, Italy Hakim Naceur, France Hassane Naji, France S.S. Ravindran, USA Alba Sofi, Italy Keivan Navaie, UK Alessandro Reali, Italy Francesco Soldovieri, Italy Dong Ngoduy, New Zealand Oscar Reinoso, Spain Raffaele Solimene, Italy Tatsushi Nishi, Japan Nidhal Rezg, France Jussi Sopanen, Finland Xesús Nogueira, Spain Ricardo Riaza, Spain Marco Spadini, Italy Ben T. Nohara, Japan Gerasimos Rigatos, Greece Ruben Specogna, Italy Mohammed Nouari, France Francesco Ripamonti, Italy Sri Sridharan, USA Mustapha Nourelfath, Canada Eugenio Roanes-Lozano, Spain Ivanka Stamova, USA Roger Ohayon, France BrunoG.M.Robert,France Salvatore Strano, Italy Mitsuhiro Okayasu, Japan José Rodellar, Spain Yakov Strelniker, Israel Calogero Orlando, Italy Rosana Rodríguez López, Spain Sergey A. Suslov, Australia Alejandro Ortega-Moñux, Spain Ignacio Rojas, Spain Thomas Svensson, Sweden Naohisa Otsuka, Japan Alessandra Romolo, Italy Andrzej Swierniak, Poland Erika Ottaviano, Italy Debasish Roy, India Andras Szekrenyes, Hungary Arturo Pagano, Italy Gianluigi Rozza, Italy Yang Tang, Germany Alkis S. Paipetis, Greece Rubén Ruiz García, Spain Alessandro Tasora, Italy Alessandro Palmeri, UK Antonio Ruiz-Cortes, Spain Sergio Teggi, Italy Pasquale Palumbo, Italy Ivan D. Rukhlenko, Australia Alexander Timokha, Norway Elena Panteley, France Mazen Saad, France Gisella Tomasini, Italy Achille Paolone, Italy Kishin Sadarangani, Spain Francesco Tornabene, Italy Xosé M. Pardo, Spain Andrés Sáez, Spain Antonio Tornambe, Italy Manuel Pastor, Spain Mehrdad Saif, Canada Javier Martinez Torres, Spain Pubudu N. Pathirana, Australia Salvatore Salamone, USA George Tsiatas, Greece Francesco Pellicano, Italy Nunzio Salerno, Italy Antonios Tsourdos, UK Marcello Pellicciari, Italy Miguel A. 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