Confidential computers shall not use computer peripherals with wireless interconnection function such as wireless keyboard, wireless mouse and wireless network card. These devices are connected to the computer wirelessly, and the signals for processing and transmitting information are completely exposed to the air. Irrelevant personnel can receive these signals through related technical equipment and carry out signal recovery processing. Therefore, classified computers cannot use computer peripherals with wireless interconnection function.
It should be noted that foreign countries, especially some developed countries, often require their electronic equipment designers such as computers and encryption machines to set up "back doors" in exported computers and equipment to facilitate the theft of information from other countries. In addition, some computers have wireless interconnection function, and some security can not meet the standard. Buying such a computer and using it to process confidential information can easily leave hidden dangers of leakage and information security.