Security experts warn Wi-Fi users to be more vigilant against hackers . In 2008 , AirTight Networks dispatched a number of so-called `` white hat '' hackers to 27 airports around the world to test the vulnerability of their Wi-Fi systems . Experts say it 's difficult to distinguish between legitimate and rogue networks . Comment: Users urged to protect their networks , use VPN for sensitive data .
Security experts warn Wi-Fi users to be more vigilant against hackers . Experts say it 's difficult to distinguish between legitimate and rogue networks . Comment: Users urged to protect their networks , use VPN for sensitive data .