A collaborative approach for identifying privacy disclosure in Web-based services

Nowadays, abundance of Web applications offers flexible and convenient services for users. Although almost all Web sites have their own privacy policies and declare that they won´t disclose users´ privacy without their consent, users may still receive spam messages after they register or interact with some sites. Obviously, commercial interests can drive some sites to disclose users´ privacy such as email addresses to third parties. In this paper, we propose a collaborative method to identify Web sites that disclose users´ privacy by using a privacy disclosure finding protocol inspired from secure multiparty computation (SMC). The advantages of our method are that the method can identify privacy disclosure sites while preserving volunteers´ privacy and that the method uses a collaborative approach without relying on a trusted third party which makes it practical in the reality of Web based services.