This book constitutes the refereed proceedings of the 8th International Joint Conference on E-Business and Telecommunications, ICETE 2011, held in Seville, Spain in July 2011. The 118 revised full papers presented were carefully reviewed and selected from 409 submissions. The topics covered are data communication networking, e-business, optical communication systems, security and cryptography, signal processing and multimedia applications, and wireless networks and information systems. These are the main knowledge areas that define the six component conferences, namely: DCNET, ICE-B, OPTICS,...