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Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider
(2020)Journal of Physics G: Nuclear and Particle PhysicsParticles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these long-lived particles (LLPs) can decay far from the interaction vertex of the primary proton–proton collision. Such LLP signatures are distinct from those of promptly decaying particles that are targeted by the majority of searches ...Report -
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Ratio Buckets: A Numeric Method for k-fold Tight Differential Privacy
(2017)Cryptology ePrint ArchivePrivacy guarantees of a privacy-enhancing system have to be robust against thousands of observations for many realistic application scenarios, such as anonymous communication systems, privacy-enhancing database queries, or privacy-enhancing machine-learning methods. The notion of r-fold Approximate Differential Privacy (ADP) offers a framework with clear privacy bounds and with composition theorems that capture how the ADP bounds evolve ...Report -
Anonymity Trilemma: Strong Anonymity, Low Bandwidth Overhead, Low Latency—Choose Two
(2017)Cryptology ePrint ArchiveThis work investigates the fundamental constraints of anonymous communication (AC) protocols. We analyze the relationship between bandwidth overhead, latency overhead, and sender anonymity or recipient anonymity against the global passive (network-level) adversary. We confirm the trilemma that an AC protocol can only achieve two out of the following three properties: strong anonymity (i.e., anonymity up to a negligible chance), low bandwidth ...Report -