1. An electronic device, comprising: a circuit chip; and a nanomaterial coating, the nanomaterial coating forming a continuous layer of nanomaterial that covers a continuous surface of the circuit chip and protects the circuit chip from: identifying a chip structure of the circuit chip, wherein the nanomaterial coating includes strips of nanoshells with different thicknesses for shifting optical absorption wavelength of the nanomaterial coating, wherein said nanoshells are silicon based nanomaterials coated with gold.