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80% of WiFi networks are insecure

After completing the Cisco Wireless Fundamental Instructor course earlier in May 04, we were made very aware how insecure a WiFi network is.
For simplicity reasons the access points by default are very open, and few installers bother to change this.
According to a report from global wireless security company Red-M, most global businesses are at risk because they have not secured their wireless infrastructures.
The six-month study of 100 companies across the globe, including large multinational corporations covering a range of industry sectors, found that 80 per cent of corporate networks are accessible from outside their buildings.
Two thirds of banks, 60 per cent of financial services institutions and all education institutions leaked data, the study claimed.
vnunet.com Four-fifths of networks bleeding Wi-Fi data