Aiming at the problems of the computer information leakage protection equipment at present,an information hiding and protection equipment was designed and implemented based on the whitening technology.The protection signal was used to whiten the leakage in order to hide and interfere with the leaked information.Frequency domain analysis and experimental results show that the device hides the leaked information effectively.Compared to the existing leakage protection equipment,the correlation of the leakage and the original information decreases significantly.This device provides a more practical way to protect the computer information.