This book presents original results on the leading edge of computer science research. Each article has been carefully selected in an attempt to present substantial research results across a broad spectrum. Topics discussed include telecommunication network security; application of cloud computing in preclinical radiation treatment planning; computational cryptography based on phase encoding and intensity pattern superposition via optics theory; an agent-based optimized cloud service discovery system; computing network reliability with diameter constraints; a survey on the open source tools for modelling and implementing enterprise application integration solutions; a technology proposal to realize enterprise application integration.