Introduction.- Ocean energy Converters.- Underwater wireless power transfer.- History.- Motivation.- Challenges.- Applications.- Design and Modeling of a Smart Wave Energy Converter.- Introduction.- Conceptual design of the Smart-WEC.- Smart-WEC Working Principles.- Hydrodynamics Model.- Electrical System Model.- Study and Analysis of Underwater Wireless Power Transfer.- Introduction.- Wireless Power Transfer in Air, Freshwater, and Seawater.- UWPT System Overview.- Coil analysis in Open Air and Underwater Environments.- Resistance of a coil in air compared to seawater.- Inductance of a coil in air compared to seawater.- Coil Topology.- Optimized Coil Design Procedure.- Maximum Power Efficiency Tracking for UWPT.- Overview of Maximum Power Efficiency Tracking.- Estimation of Coupling Coefficient.- Modeling of the DC-DC converter.- Controller Design.- UWPT Resonance Frequency Analysis.- Coupling Coefficient Estimation.- UWPT Efficiency Maximization.- Experimental Verification.- Model Predictive Control.- Control Strategy.- Current Error Prediction.- Regular Waves.- Irregular waves.- Data security and Energy Encryption.- Introduction.- Data security.- Energy encryption. sakriti opis