Location sharing services are becoming increasingly popular. Although many location sharing services allow users to set up privacy policies to control who can access their location, the use made by service providers remains a source of concern. Ideally, location sharing providers and middleware should not be able to access users’ location data without their consent. In this paper, we propose a new location sharing protocol called Longitude that eases privacy concerns by making it possible to share a user’s location data blindly and allowing the user to control who can access her location, when and to what degree of precision. The underlying cryptographic algorithms are designed for GPS-enabled mobile phones. We describe and evaluate our implementation for the Nexus One Android mobile phone.
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机译：位置共享服务越来越受欢迎。尽管许多位置共享服务允许用户设置隐私策略来控制谁可以访问其位置，但是服务提供商的使用仍然令人担忧。理想情况下，未经用户同意，位置共享提供者和中间件应该不能访问用户的位置数据。在本文中，我们提出了一种称为经度的新位置共享协议，该协议可以通过盲目的共享用户的位置数据并允许用户控制谁可以访问她的位置，何时以及以何种程度的精确度来缓解隐私问题。基本的加密算法是为启用GPS的手机设计的。我们描述并评估了Nexus One Android手机的实现方式。
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