A new kind of countermeasurer that prevents the information leakage caused by the computer electromagnetic radiation was firefly introduced. This countermeasurer adopted the method which the software and hardware unifies to produce stochastic electromagnetic wave signal which has very wide frequency bands scope. The noise signal was mixed with the useful information which computer divulged together to submerge and cover the computer useful information, even if someone intercepted this composite signal, it still could not withdraw useful information from the mixed signal. The range of noise sig...
