A multilayer wiring board has a high degree of freedom of wiring design and can realize high-density wiring, and a method to simply manufacture the multilayer wiring board. The decoy routing system includes a client computing device, a decoy router, and a decoy proxy such that packets addressed to a decoy destination are re-routed by the decoy router to a covert destination via the decoy proxy. The method further includes limiting the number of consecutive times a particular block is coded as skipped without re-setting the quantization level to a relatively fine level of quantization and re-selecting the mode.