This book constitutes the refereed proceedings of the 15th International Joint Conference on E-Business and Telecommunications, ICETE 2018, held in Porto, Portugal, in July 2018. ICETE is a joint international conference integrating four major areas of knowledge that are divided into six corresponding conferences: International Conference on Data Communication Networking, DCNET; International Conference on E-Business, ICE-B; International Conference on Optical Communication Systems, OPTICS; International Conference on Security and Cryptography, SECRYPT; International Conference on Signal Processing and Multimedia, SIGMAP; International Conference on Wireless Information Systems, WINSYS. The 11 full papers presented in the volume were carefully reviewed and selected from the 201 submissions. The papers cover the following key areas of information and communication technologies: data communication networking, e-business, optical communication systems, security andcryptography, signal processing and multimedia applications, and wireless networks and mobile systems.