Public Wi-Fi Networks: Risks and Tips to Protect Your Data

Using public Wi-Fi networks in airports, hotels, cafés or shopping centres can be convenient, but it is important to understand the risks. Many websites and apps now encrypt connections, but that does not mean every open network is suitable for entering passwords, banking details or professional information.

Risks of public Wi-Fi

• Fake networks: access points that imitate the name of a hotel, airport or café.
• Traffic interception: especially when using websites without HTTPS or poorly configured apps.
• Credential theft: fake login pages or misleading captive portals.
• Exposed devices: file sharing, printers or local services enabled on an untrusted network.
• Open sessions: accounts left signed in on shared or unsafe devices.

When to avoid public Wi-Fi

Avoid using it for online banking, card payments, administration panels, customer data, medical records, confidential documents or sensitive corporate systems. If you need to work with important information, mobile data or a corporate VPN is safer.

Tips if you have no alternative

1. Check the exact network name with the establishment.
2. Use only HTTPS websites and check the browser lock icon.
3. Enable a VPN if you are working or accessing important services.
4. Disable file sharing, printer sharing and network discovery.
5. Do not install certificates, profiles or apps requested by an unknown network.
6. Prevent the device from automatically joining open networks.
7. Log out when finished and enable multifactor authentication on your accounts.

Public Wi-Fi and data protection

If you work with personal data, connecting through public networks without safeguards may increase the risk of a security breach. Companies should give staff clear instructions on when to use mobile data, VPNs, corporate devices and approved tools.

Recommended official sources

• INCIBE: secure connections and public Wi-Fi.
• INCIBE: Wi-Fi security guide.
• FTC: public Wi-Fi safety.

Conclusion

Public Wi-Fi is not always dangerous, but it should never be treated as a trusted network. For sensitive tasks, use mobile data, VPN and services with multifactor authentication. Convenience should not come before data security.