The 9th International Conference on Network and System Security held during November 3-5, 2015, in New York City. NSS 2015 was organized and supported by Pace University and New York Institute of Technology (NYIT). Since its inauguration in 2007, NSS has become a highly successful series of annual international gatherings, for academic and industrial researchers and practitioners to exchange ideas in the area of network and systemsecurity. Previous editions of NSS were held in: Xi'an, China (2014); Madrid, Spain(2013); Wu Yi Shan, China(2012); Milan, Italy (2011); Melbourne, Australia; (2010); Gold Coast, Australia (2009).

The conference this year received 110 submissions. Each submission was carefully reviewed by at least three, and mostly four, Program Committee members. The Program Committee decided to accept 23 full papers and 18 short papers. The program also included three invited talks, which were given by Professor Steven M. Bellovin (Columbia University, USA), Professor Michael Reiter (University of North Carolina at Chapel Hill, USA), and Professor Gene Tsudik (University of California, Irvine, USA )

The 2nd IEEE International Conference on Cyber Security and Cloud Computing is in conjunction with NSS2015, it aims to gather recent achievements in cyber security and cloud computing fields. The conference invites those papers that concentrate on new paradigms, algorithms, and applications in cyber security or cloud computing.