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Trust Management (TM) systems for authentication are vital to the security of online interactions, which are ubiquitous in our everyday lives. Various systems, like the Web PKI (X.509) and PGP's Web of Trust are used to manage trust in this setting. In recent years, blockchain technology has been introduced as a panacea to our security problems, including that of authentication, without sufficient...
Online Social Networks (OSNs) are the core of many social interactions nowadays. Privacy is an important building block of free societies, and thus, for OSNs. Therefore, OSNs should support privacy-enabled communication between citizens that participate. OSNs function as group communication systems and can be build in centralized and distributed styles. Centralized, privacy is under the sole control...
Online Social Networks (OSNs) are the core of most communications nowadays, leading to possibly sensitive information exchange. Privacy is an important building block of free societies, and thus, for OSNs. OSNs function as group communication systems and can be build in centralised and distributed styles. Privacy can be achieved in distributed systems as all participants contribute to privacy. Peer-to-peer-based...
Publish-subscribe is an increasingly popular messaging pattern for distributed systems, supporting scalable and extensible programming, and optimal spatial, temporal, and control-flow decoupling of distributed components. Publish-subscribe middleware and methods were extended towards supporting security, in particular confidentiality, and increased availability, yet a few prior works addressed anonymity...
Anonymity can protect from political repression in Online Social Networks (OSNs) as well as from undesired profiling, e.g., by advertisement companies, in todays' Internet. P2P-based anonymous publish-subscribe (pub-sub) is a highly-scalable approach to protect anonymity while enabling efficient many-to-many communication between services and users. However, churn and the resulting overlay degradation...
We present an IoT privacy architecture covering End-2-End data handling at devices, connections and in the cloud. The system is driven by privacy policies negotiated between service providers and consumers.
The Internet of Things (IoT) brings together a multitude of technologies, with a vision of creating an interconnected world. This will benefit both corporations as well as the end-users. However, a plethora of security and privacy challengesneed to be addressed for the IoT to be fully realized. In thispaper, we identify and discuss the properties that constitutethe uniqueness of the IoT in terms of...
Internet of Things (IoT) technology is rapidly gaining popularity, not only in industrial and commercial environments, but also in our personal life by means of smart devices at home. Such devices often interconnect with cloud services that promise easy usage and global access. However, managing the balance between trust in the service provider and need for privacy of individuals becomes a major challenge...
Privacy, in particular anonymity, is desirable in Online Social Networks (OSNs) like Twitter, especially when considering the threat of political repression and censorship. P2P-based publish-subscribe is a well suited paradigm for OSN scenarios as users can publish and follow topics of interest. However, anonymity in P2P-based publish-subscribe (pub-sub) has been hardly analyzed so far. Research on...
Privacy, in particular anonymity, is required to increase the acceptance of users for the Internet of Things (IoT). The IoT is built upon sensors that encompass us in each step we take. Hence, they can collect sensitive, privacy-invading data that can be used to establish complete user profiles. For this reason, sensing in the IoT needs to provide means of privacy-protection. In this paper, we discuss...
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