891 research outputs found
Economic location-based services, privacy and the relationship to identity
Mobile telephony and mobile internet are driving a new application paradigm: location-based services (LBS). Based on a person’s location and context, personalized applications can be deployed. Thus, internet-based systems will continuously collect and process the location in relationship to a personal context of an identified customer. One of the challenges in designing LBS infrastructures is the concurrent design for economic infrastructures and the preservation of privacy of the subjects whose location is tracked. This presentation will explain typical LBS scenarios, the resulting new privacy challenges and user requirements and raises economic questions about privacy-design. The topics will be connected to “mobile identity” to derive what particular identity management issues can be found in LBS
Anonymous network access using the digital marketplace
With increasing usage of mobile telephony, and the trend towards additional mobile Internet usage, privacy and anonymity become more and more important. Previously-published anonymous communication schemes aim to obscure their users' network addresses, because real-world identity can be easily be derived from this information. We propose modifications to a novel call-management architecture, the digital marketplace, which will break this link, therefore enabling truly anonymous network access
SHARVOT: secret SHARe-based VOTing on the blockchain
Recently, there has been a growing interest in using online technologies to
design protocols for secure electronic voting. The main challenges include vote
privacy and anonymity, ballot irrevocability and transparency throughout the
vote counting process. The introduction of the blockchain as a basis for
cryptocurrency protocols, provides for the exploitation of the immutability and
transparency properties of these distributed ledgers.
In this paper, we discuss possible uses of the blockchain technology to
implement a secure and fair voting system. In particular, we introduce a secret
share-based voting system on the blockchain, the so-called SHARVOT protocol.
Our solution uses Shamir's Secret Sharing to enable on-chain, i.e. within the
transactions script, votes submission and winning candidate determination. The
protocol is also using a shuffling technique, Circle Shuffle, to de-link voters
from their submissions.Comment: WETSEB'18:IEEE/ACM 1st International Workshop on Emerging Trends in
Software Engineering for Blockchain. 5 pages, 2 figure
Hang With Your Buddies to Resist Intersection Attacks
Some anonymity schemes might in principle protect users from pervasive
network surveillance - but only if all messages are independent and unlinkable.
Users in practice often need pseudonymity - sending messages intentionally
linkable to each other but not to the sender - but pseudonymity in dynamic
networks exposes users to intersection attacks. We present Buddies, the first
systematic design for intersection attack resistance in practical anonymity
systems. Buddies groups users dynamically into buddy sets, controlling message
transmission to make buddies within a set behaviorally indistinguishable under
traffic analysis. To manage the inevitable tradeoffs between anonymity
guarantees and communication responsiveness, Buddies enables users to select
independent attack mitigation policies for each pseudonym. Using trace-based
simulations and a working prototype, we find that Buddies can guarantee
non-trivial anonymity set sizes in realistic chat/microblogging scenarios, for
both short-lived and long-lived pseudonyms.Comment: 15 pages, 8 figure
- …