4 papers · 1 filter
Beyond Identity Creation: Bilinear Sybil Cost in Identities and Time
Homayoun Maleki, Nekane Sainz, Jon Legarda +1
Sybil defenses price the creation of an identity, yet influence goes, again and again, to active identities. We study the cost of maintaining influence. A defense has a bilinear Sy…
Sustained Participation as a Security Resource: The Bounded Participation Channel
Homayoun Maleki, Nekane Sainz, Jon Legarda +1
Can sustained, per-identity participation be engineered into a security resource? Most anti-Sybil defenses price identity creation rather than identity survival. Once admitted, an…
Scarcity Is Not Enough: Structural Limits of Linear Sybil Cost Under Parallelizable Resources
Homayoun Maleki, Nekane Sainz, Jon Legarda +1
Permissionless systems resist Sybil attacks by binding influence to scarce resources. Yet influence concentration persists across systems built on computation, capital, and other r…
Human Challenge Oracle: Designing AI-Resistant, Identity-Bound, Time-Limited Tasks for Sybil-Resistant Consensus
Homayoun Maleki, Nekane Sainz, Jon Legarda
Sybil attacks remain a fundamental obstacle in open online systems, where adversaries can cheaply create and sustain large numbers of fake identities. Existing defenses, including…