Japan has been developing a virus that could track down the source of a cyber attack and neutralise its program, the daily Yomiuri Shimbun reported on Sunday.
The weapon is the culmination of a Y179 million ($A2.28 million) three-year project entrusted by the government to technology maker Fujitsu Ltd to develop a virus and equipment to monitor and analyse attacks, the daily said.
The United States and China are reported to have put so-called cyber weapons into practical use, Yomiuri said.
Japan will have to make legal amendments to use a cyber weapon as it could violate the country's law against the manufacture of a computer virus, the daily said. (MSN)
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