This is a brief whitepaper that discusses threats and mitigations against those threats when using open wireless access points.
You can download it from the following link: https://packetstormsecurity.com/files/download/129913/openwifimitigations.pdf
Source: https://packetstormsecurity.com/files/129913/Open-Wi-Fi-Hotspots-Threats-And-Mitigations.html