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...undamental drawback of the Micro-Blog architecture, although techniques from related work that allow clients to securely exchange locations through a mutually untrusted intermediary may be applicable =-=[42]-=-. Nonetheless, we currently assume that users are willing to trust the Micro-Blog service. In the simplest case, a MicroBlog client operates in three modes: private, social, andpublic. The private mod...

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...y in a previous workshop paper [18]. Although we sketched some of the challenges in designing Tryst in [18], this paper is the first to present its cryptographic design and implementation. Cox et al. =-=[9]-=- present a protocol for privately announcing your presence to your friends. This protocol is similar to Tryst in spirit because it uses symmetric key cryptography to compute temporary addresses. Howev...

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...ommodity hardware (cellular phone, laptop computer, PDA, etc.). The CenceMe notion of sensing presence sharing and logging differs from the idea of presence sharing and exchange presented in [22] and =-=[23]-=-. The latter idea refers to the beaconing of personal information using short range radio. The CenceMe notion incorporates in situ exchanges (e.g., via the buddy beacon service), but extends beyond th...

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...-located users to deterministically compute the same encounter identifier without revealing any information about the encounter’s place or time to entities that were not present. Finally, SmokeScreen =-=[4]-=- is a mobile social service that uses short-range wireless messages among co-located users to en-able “presence-sharing.” Smokescreen is primarily meant to enable privacy-preserving presence-sharing ...

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...cure localization service that can be used to generate unforgeable geotags for mobile content such as photos and video. However this work relies on the high-cost trusted computing module. SmokeScreen =-=[4]-=- introduces a presence sharing mobile social service between co-located users which relies on centralized, trusted brokers to coordinate anonymous communication between strangers. SMILE [17] [18] allo...

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..., several mechanisms used in this system are complementary to our work here. Several researchers have looked at building specific mobile social applications while preserving user privacy. SmokeScreen =-=[6]-=- is designed to share presence information only with trusted users,and missed connections [19] looks at connecting users that shared a physical location without compromising their privacy at the serv...

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...hat facilitates the development of privacy sensitive ubiquitous applications. SmokeScreen uses opaque identifiers, which can be resolved only by a trusted broker, for presence sharing among strangers =-=[23]-=-. AnonySense is an architecture for peoplecentric sensing that protects user privacy through anonymity [24]. While social context, and especially relations between communities and their places, have r...

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...ome much less functional. Moreover, the server itself must be trusted since it has access to all tracks. To alleviate this concern, StarTrack could adopt well-known techniques for cloaking track data =-=[19, 16, 20]-=-. 2.3 Programming Interface The operations in StarTrack’s API fall into five categories: recording, manipulating, comparing, clustering, and querying tracks. Table 1 lists a simplified set of key oper...

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...s is possible [8], but this may limit functionality for certain PHY/MAC technologies. Providing truly anonymous data exchange for ad hoc mobile devices is a focus of ongoing research in the community =-=[5]-=-, but is outside the scope of this paper. 3.2 Social-network-driven model and training data sharing With social-network-driven training data sharing and model sharing, we aim to leverage social connec...

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...deo rentals that match their interests. Performance metrics are gathered for the SSA Authentication Server and the results have shown that it works reasonably well. C. SmokeScreen Landon P. Cox et al =-=[51]-=- have presented a system called SmokeScreen that provides flexible and power-efficient mechanisms for privacy management. The authors have described two complementary mechanisms. First, to enable flex...