Dongtao Liu

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Online social networks (OSNs) are immensely popular, but their centralized control of user data raises important privacy concerns. This paper presents Vis-à-Vis, a decentralized framework for OSNs based on the privacy-preserving notion of a Virtual Individual Server (VIS). A VIS is a personal virtual machine running in a paid compute utility. In(More)
Online social networks (OSNs) are immensely popular, but participants are increasingly uneasy with centralized services' handling of user data. Decentralized OSNs offer the potential to address user's anxiety while also enhancing the features and scalability offered by existing, centralized services. In this paper, we present Confidant, a decentralized OSN(More)
Users routinely access cloud services through third-party apps on smartphones by giving apps login credentials (i.e., a username and password). Unfortunately, users have no assurance that their apps will properly handle this sensitive information. In this paper, we describe the design and implementation of ScreenPass, which significantly improves the(More)
Mobile apps increasingly require users to login to remote services such as Facebook and Twitter. Unfortunately, today's mobile platforms provide weak protection for login credentials such as passwords. To address this problem, we introduce the idea of an attested login and an embodiment of this idea called VeriUI. Attested login augments user credentials(More)
Delivering high definition video (HDV) is a typical application on the next generation Internet (NGI). This paper pays attention to the packet loss during real-time delivering of HDV, aiming to seek an effective FEC scheme, which causes negligible additional delay and can meet different users' requirement of quality of service (QoS). Based on the character(More)
Video conferencing systems have been widely used all over the word and bring much convenience to our daily life. With the increase of network capability, users of video conference desire upgrade of video quality more and more intensively. However, the extensibility for large-scale standard-definition video conference is seriously restricted by the ability(More)
Multicast based audio/video collaboration system is one of representative applications in next generation internet. Adopting multicast technique could save bandwidth for multipoint-to-multipoint audio/video communication. Lack of ubiquitous native multicast limits the application, and current multicast based A/V collaboration systems lack effective control(More)
Facts • OSNs are popular, useful and fun • OSNs grow fast and become a platform • OSNs are centralized and " free " Cloud-based Approach: Vis-à-Vis [2] Desktop-based Approach: Confidant [3] Intuition: If friends are allowed to access user's data then she can ask some of these friends to provide a storage service for her • Privacy is a currency to pay for(More)
In application layer multicast, peers' local service capacities are heterogeneous and span a large range, how to arrange the number of the node's connections is one load-balancing issue. The other important aspect of constructing efficient overlay network is to exploit network locality in the underlying network to decrease delivery latency for media(More)