A report by computer security company, McAfee, which claims that China is the most aggressive hacker in the world, has been hotly denied by Beijing.

The report indicated that China was the world's most aggressive offender in probing for holes in other nations' Internet security and that it is at the forefront of a cyber cold war.

But China's Foreign Ministry spokesman, Liu Jianchao, said at a briefing that his country has also been attacked by hackers of other countries, thus, the Chinese government attaches great importance to and participates in international law enforcement cooperation in this area. Liu refused to reveal which countries were targeting China.

McAfee said about 120 countries are developing cyber attack strategies and most are merely testing them to determine the risks involved in certain tactics.